If you are reading this please consider testing this. The best test suite in the world is users and the more we catch in -pre the fewer issues will make it to release 
Bug Fixes
- Bug 31661 - Button Image is scaled incorrectly
- Bug 31608 - Xamarin.Forms RowDefinition Binding does not work
- Bug 31561 - Back button used to navigate back does not maintain hidden button on destination page
- Bug 31529 - MarkupExpression parser doesn't work with extra whitespaces
- Bug 31482 - On a Nexus 7, if you start the app in landscape mode, than Device.Idiom reports Phone instead of Tablet.
- Bug 31395 - Crash when switching MainPage and using a Custom Render
- Bug 31324 - Using a x:Name in a style on the xaml resources side causes controls to be created in the generated file.
- Bug 31207 - Global styles (including built-in ones) extend pages lifetime causing a memory leak
- Bug 31094 - setting picker.selectedindex to -1 visualize item with selected index 0
- Bug 30835 - Navigating to and from the Carousel page with MasterDetail page creates an Out of memory exception
- Bug 30835 - (Out_of_memory) Navigating to and from the Carousel page with MasterDetail page creates an Out of memory exception
- Bug 30754 - Drag causing tap event
- Bug 30094 - Issue with TapGestureRecognizer on Android
- Bug 29501 - [Windows] "The name 'InitializeComponent' does not exist in the current context" error when building Windows app
- Bug 29290 - ViewCell exception on WinPhone
- Bug 29287 - Attempt to get attributes for class derived from Xamarin Forms ContentPage throws in 1.4.2
- Bug 29214 - Setting button as visible with IsVisible causes text layout options to be ignored
- Bug 29184 - Group Header Text Font Color in ListView
- Bug 28939 - Entry Control loses cursor position to either beginning or end of input
- Bug 28719 - Triggers inside DataTemplate give XAML runtime error
- Bug 28520 - Windows Phone RT ListView ItemSelected event & SelectedItem property only fires once
- Bug 28312 - When Master page is open, on rotating the device it does not update the rendering
- Bug 27502 - Content of a ViewCell disappears when it's selected in a ListView
- Bug 27412 - Keyboard remains visible on Android after setting Focus to an entry and then leaving the app using Home button
- Bug 27378 - Navigation.InsertPageBefore causes AurgumentException only on Windows Phone
- Bug 27314 - Button text alignment changes after button is pressed
- Bug 27281 - Android - Button Text Alignment not correct after navigation from TabbedPage
- Bug 27119 - WindowsPhone DisplayActionSheet does not await
- Bug 27095 - SwitchCell behaves different from TextCell
- Bug 27085 - EntryCell has no possibility to hide keyboard on iOS
- Bug 26783 - [iOS] - Scrolling causes animations to pause
- Bug 26696 - Android - Button text alignment changes on Samsung Galaxy S2
- Bug 26171 - Xamarin.Forms.Maps is not updating VisibleRegion property when layout is changed
- Bug 26032 - ListView ItemTapped doesn't get called for the selected item
- Bug 25979 - Removing page from Navigation stack throws System.ArgumentException
- Bug 24574 - GestureRecognizer not firing for double tap. (Now works for single and double tap. For more than that we'd have to start implementing our own gesture detector.)
- Bug 24054 - BindableObject.ApplyBindings is broken when the old bindingcontext was null
Other Fixes
- [Core] Some memory leaks plugged
- [Core] Remove some cases where first chance exceptions were being thrown to make debugging easier
- [Core] Grid RowDefinition/ColumnDefinition can now be set with a Style
- [WinRT] Fix potential crasher on ListView item selection
- [iOS] Fix issue where ListView.Header could grow without bound in some situations