So yea, I just patched up to 4.3. First I noted, that it have cleared my Graphic settings (Started as Fullscreen (normally playing in Windowed), and UI scale at 1, not a really big deal), but just as a note.

When I'm starting WoW, it's setting my mouse speed down to minimum, and it permanently changes it (till I change it again, right now it's only in WoW because I have System Preferences open), and it's rather annoying. This didn't happend at PTR.
EDIT: Figured out, the Mouse Sensitivity is starting at 0 (the moving pen not there, so it keeps change to minimum), and it affects the computer as well.

When I opened WoW to accept EULA/TOS I got this LUA error message:
Message: Interface\FrameXML\GraphicsQualityLevels.lua:402: attempt to index field '?' (a nil value)
Time: Wed Nov 30 13:35:20 2011
Count: 2
Stack: Interface\FrameXML\GraphicsQualityLevels.lua:402: in function `onCapCheck'
Interface\FrameXML\VideoOptionsPanels.lua:211: in function `ControlCheckCapTargets'
Interface\FrameXML\VideoOptionsPanels.lua:688: in function `VideoOptionsDropDown_OnLoad'
[string "*:OnLoad"]:1: in function <[string "*:OnLoad"]:1>

Locals: self = Graphics_MultiSampleDropDown {
0 = <userdata>
description = "Increase multisampling to smooth out model edges. Increasing multisampling can severely reduce performance."
RefreshValue = <function> defined @Interface\FrameXML\VideoOptionsPanels.lua:450
readfilter = <function> defined @Interface\FrameXML\GraphicsQualityLevels.lua:368
tablefunction = <function> defined @Interface\FrameXML\GraphicsQualityLevels.lua:363
key = Graphics_MultiSampleDropDown {
}
table = <table> {
}
maxValue = 5
GetNewValueString = <function> defined @Interface\FrameXML\VideoOptionsPanels.lua:643
lookup = <function> defined @Interface\FrameXML\VideoOptionsPanels.lua:349
notifytarget = <function> defined @Interface\FrameXML\VideoOptionsPanels.lua:657
TABLENEXT = 3
noResize = 1
restart = true
width = 110
doGetValue = <function> defined @Interface\FrameXML\GraphicsQualityLevels.lua:376
onCapCheck = <function> defined @Interface\FrameXML\GraphicsQualityLevels.lua:380
cvarCaps = <table> {
}
type = 2
GetValue = <function> defined @Interface\FrameXML\VideoOptionsPanels.lua:633
name = "Multisampling"
initialize = <function> defined @Interface\FrameXML\VideoOptionsPanels.lua:568
warning = Graphics_MultiSampleDropDownWarning {
}
needrefresh = false
tablerefresh = true
SetValue = <function> defined @Interface\FrameXML\GraphicsQualityLevels.lua:372
}
capMaxValue = 1
tooltip = nil
(for generator) = <function> defined =[C]:-1
(for state) = <table> {
Graphics_LiquidDetailDropDown = "waterDetail"
Graphics_ResolutionDropDown = "gxResolution"
Graphics_SunshaftsDropDown = "sunshafts"
}
(for control) = "Graphics_LiquidDetailDropDown"
key = "Graphics_LiquidDetailDropDown"
cvar = "waterDetail"
dropDown = Graphics_LiquidDetailDropDown {
0 = <userdata>
description = "Controls the rendering quality of liquid. Decreasing this may improve performance."
RefreshValue = <function> defined @Interface\FrameXML\VideoOptionsPanels.lua:450
selectedID = 5
data = <table> {
}
needrefresh = false
key = Graphics_LiquidDetailDropDown {
}
GetNewValueString = <function> defined @Interface\FrameXML\VideoOptionsPanels.lua:643
type = 2
GetValue = <function> defined @Interface\FrameXML\VideoOptionsPanels.lua:633
dependent = <table> {
}
lookup = <function> defined @Interface\FrameXML\VideoOptionsPanels.lua:349
tablerefresh = true
notifytarget = <function> defined @Interface\FrameXML\VideoOptionsPanels.lua:657
noResize = 1
name = "Liquid Detail"
initialize = <function> defined @Interface\FrameXML\VideoOptionsPanels.lua:568
capTargets = <table> {
}
warning = Graphics_LiquidDetailDropDownWarning {
}
width = 110
SetValue = <function> defined @Interface\FrameXML\VideoOptionsPanels.lua:316
}
cvarValue = "2"
capValue = 1
setting = nil
(*temporary) = nil
(*temporary) = 5
(*temporary) = Graphics_LiquidDetailDropDown {
0 = <userdata>
description = "Controls the rendering quality of liquid. Decreasing this may improve performance."
RefreshValue = <function> defined @Interface\FrameXML\VideoOptionsPanels.lua:450
selectedID = 5
data = <table> {
}
needrefresh = false
key = Graphics_LiquidDetailDropDown {
}
GetNewValueString = <function> defined @Interface\FrameXML\VideoOptionsPanels.lua:643
type = 2
GetValue = <function> defined @Interface\FrameXML\VideoOptionsPanels.lua:633
dependent = <table> {
}
lookup = <function> defined @Interface\FrameXML\VideoOptionsPanels.lua:349
tablerefresh = true
notifytarget = <function> defined @Interface\FrameXML\VideoOptionsPanels.lua:657
noResiz
Ingame I got 3 OptionsPanelTemplates (when I wanted to change my graphics) LUA errors, here's 1:
Message: Interface\FrameXML\OptionsPanelTemplates.lua:425: Usage: InterfaceOptionsMousePanelMouseSensitivitySlider:SetValue(value)
Time: Wed Nov 30 13:36:12 2011
Count: 1
Stack: [C]: in function `SetDisplayValue'
Interface\FrameXML\OptionsPanelTemplates.lua:425: in function <Interface\FrameXML\OptionsPanelTemplates.lua:373>
[C]: in function `securecall'
Interface\FrameXML\OptionsPanelTemplates.lua:351: in function <Interface\FrameXML\OptionsPanelTemplates.lua:309>

Locals: (*temporary) = InterfaceOptionsMousePanelMouseSensitivitySlider {
0 = <userdata>
type = 3
tooltipText = "Adjust the speed at which the mouse cursor moves."
defaultValue = 1
event = "MOUSE_SENSITIVITY"
SetValue = <function> defined *:OnLoad:4
cvar = "mouseSpeed"
SetDisplayValue = <function> defined =[C]:-1
}
(*temporary) = ""
LUA errors is not a big deal to me, but here you have them anyways.

My $ buttom (next to 1) is acting as "4" when pressed (only in WoW). I'm using a danish keyboard. This error were also at PTR, but I though that was an error with the US PTR client and EU/Danish keyboards.

When CMD clicking "Use Command instead of Control for key bindings" an item for Dressing Window, it doesn't show (Disabling the option and using CTRL works fine however). This only happens at vendors (CMD click an item in the chat works fine). This bug was also on PTR.