When animating from one state to another the content Fills the entire area( before the items was not stretched and it took the space it required). Available in LIB version: 2015.3.1026
TileViewItems' opacity is lost after drag and drop - if you set an opacity different than 1.0 in XAML it will be overridden after a DnD operation with this item.
If you have a nested TileView and its MaximizeMode is One you'll still be able to press the Minimize button of the Maximized tile and this will lead to incorrect layout.
Implement a touch swipe scrolling for RadTileView
Allow setting a number of minimized rows/columns in RadTileView Available in R1 2017 Release
Enable reordering of TileViewItems when in Minimized mode. Available in R3 2016 SP
Allow restored tiles to span multiple columns/rows. This feature is somewhat similar to allowing custom sizes of restored tiles. We have create an SDK example showing how the default panel of the RadTileView can be modified to achieve this scenario: you can find the demo in our online git hub repository (https://github.com/telerik/xaml-sdk/tree/master/TileView/RestoredTilesToSpanMultipleRowsAndColumns).