I dun get it. why all 3 regions cover art for the selected artbook are different??

rather than trying to explain myself (and probably confusing you more), just check blade combo section from the previous xb2 direct
https://youtu.be/0Hb0KmH2WBQ?t=13m31s
i've linked the correct timestamp there

xb2 is rushed yes. xb2 is short dev time, idk ~2 years is short now i guess?
not sure what's next for xenoblade series. they already spread thin post xbx with ~1/2 helping botw & ~1/2 doing xb2 (just a guesstimate). considering they're most likely doing that medieval action game right now, any new xenoblade game (be it xb3 or xbx2) will probably take more time to exist since i doubt they can split into half like what they did with botw/xb2.