I would like to see implemented these features in UE4:
Alpha channel output support through Nvidia Quadro boards.
3D animable text. I want to use dynamic 3d text to show live graphics for sports and quizzes.
Support for Excel or database files. I need this feature to collect external data for elections.
Basic parametric modeler to animate morphable objects, for example twist, bend texts or extrude on a path shapes.
Better UMG 2d features: bezier shapes, animable freehand paint
3D warp output to shape graphics for video projections.
MIDI or smpte support to sync external devices.