I finally got a chance to play a bit and I love it.
So far the battles were really easy, but I'm only at the prologue, so I'm sure it will get harder eventually. The grid system is quite cool, pushing the enemies on one field to damage them all at once is fun. :>
Controls are either buttons or touch screen (or both, if you feel like it XD). There is no voice acting. The menu is very non-Japanese-reader friendl (Everything is on English or little Icons explain what everything does, so if ppl just want to try the game out without caring for the story, it shouldn't be a problem.)
Storiwise I can't say much yet.. but... TIME TRAVEL! I'm in. I love it. Most of the staff is from Shin Megami Tensei, some from Radiata Stories. So I'm sure the story will take on to a nice, nice direction!
And I'm VERY sure Atlus US will localise the game. Also:
http://www.siliconera.com/2010/10/20/radia...nintendo-power/