I’m quite interested in and have not found a real “answer” from roadmap for Paper2D:
What is planned in terms of 2D animation? As some mentioned it would be nice to see 2D skeletal animation and especially just things like placing sprites at different positions in frames, having tweening and such things… maybe also Spriter (a 2D animation tool that has a free version) support.
Anyway, just hoping will become something highly useable with a good animation system that can do more than flipping between images 
(and preferably doesn’t require paid third-party software to use)