This feature will be available with Q2 2015 expected till the end of June. 

Resolved with Q3 2014 expected till the end of October. 

This issue will be resolved with Q3 2014 expected till the end of the month. 

The fix will be released with Q1 2016 offical version.

Should be resolved with lib version 2014.3.1124

The problem should be resolved with lib version 2015.3.1026.

The fix will be available with Q2 2015. 

This problem will be resolved in WPF with Q3 2014 expected till the end of the month. 

I use RadTileList without any tiles grouping. But internally TileListPanel get top padding 30 px. So visually I got "hole" above the list. And i can't set margin -30 because i can't be sure about this padding. 
ItemsPanelTemplate with padding="0" don't work properly as described at http://stackoverflow.com/questions/23091182/layout-issue-with-telerik-radtilelist-control.
I tnink that this top padding should be 0 px if there are no groups at tiles or no "TileGroup" elements are specified.

As a workaround you can apply the style explicitly or through an ItemContainerStyleSelector.

System.InvalidOperationException: 'Cyclic reference found while evaluating the Style property on element 'Telerik.Windows.Controls.TileGroupContainer Header: Items.Count:0'.'

The current workaround is to create the following style:

When the Tile has a Command bound to its Command property, its IsEnabled property is set to what is returned by the CanExecute method of the command. This behavior differs from the one of the standard MS Button in the same scenario.

The Tiles of the TileList control are not displayed initially when the Orientation property is set to "Horizontal" and the  GroupHeaderHeight is set to "Auto".

The measuring logic of the groups in RadTileList was changed because of a new feature which brings issues with some layouts defined in the GroupTemplate. For example, if you have a TextBlock in the GroupTemplate, and set its HorizontalAlignment to Center, the TextBlock will be positioned around the center of the RadTileList control, instead of the group's center. Also, in this case the TextBlock disappears. 

The Tile element is missing a disabled state for the Office2019 theme.