WPF like template handling has been implemented

Template binding is more like WPF now.
New features: inline templates, attached properties, collection binding.
New controls with template binding: UserControl, Repeater, UserLazyPane

ListBox, CheckedListBox, MuliselectionBox have been implemented

DropDowns sample demostrates new ListBox control.
Multiselection samples demostrates boundable multiselection controls: CheckedListBox, CheckedDropDown and MultiselectionBox

GroupBox control has been implemented

new BindingSummary samples demonstrate GroupBox control

Drag & Drop

TreeView and Grid support Drag & Drop now.

Linq namespace supported

Support for Linq namespace has been implemented

Communication is encrypted now

Client/Server communication is encrypted now.

MessageBox component has been implemented

Demonstration of MessageBox API has been added to  Window sample