For the Stargate Network team I have made a plugin that makes the migration from the UDK to UE4 easier.
It supports migrating :
Here is video that present the plugin : http://youtu.be/XBgtXgyMZnw
It’s open sourced : GitHub - Speedy37/UDKImportPlugin: Set of tools to help switching from UDK to Unreal Engine 4 and everything is explained in the Readme.
If you guys have any comments, feature requests or improvements, please don’t hesitate to ask.