Ah.. yeah. The first thing I thought when I saw the topic title was, "Already?!" They really need to buff up Mari, if not with 4th, then with a skill tree. Her current jobs are (for me, anyway) 'meh' at best.
As for Ley... concept art is nice, but her artwork still likes to emphasize her assets, it seems. =_=
But her chibi is still adorable... >_< (then again, all the GC chibis are adorable).
Design-wise, I think Ley is very beautiful though. Nevermind the skimpy-ness for a second, but her costume details are very intricate. And her backstory is interesting (if KoG doesn't screw it up, that is). If it weren't for the BAWW MARI 4TH, then I wouldn't mind Ley in general.