Yeah, I'm going to disagree with you, Chaosblade -- as far as I'm concerned, the in-game art for the Ys IV Vita characters (and Nayuta characters, for that matter) is a return to form for Falcom, as I've not been too fond of the art styles used in their last few games prior to those. In all honesty, I think the in-game Ys IV Vita art is their best Ys art since Felghana in 2005. Origin's art just felt too flat and samey to me, and Seven's was good, but a bit too "wavey" for my tastes -- not enough straight or perfectly curved lines, and not enough symmetry. Same thing with Ys vs. Sora no Kiseki.
The calendar art is good, but the in-game art is significantly better IMHO.
I'm not sure if Ys IV Vita is going to have jumping or not, but I suspect it will. I just hope it also has configurable controls, as Nayuta no Kiseki does not -- you're stuck with what you've got at the start.