I am really looking foward to this game! It looks kinda like a hybrid of advance wars and fire emblem, with it's own uniqueness to it as well, and some sort of card system. Not a whole lot is known about it so far, but it's from the makers of Riviera, so it should be pretty good.
The official site is here but it's in japanese so you'll have to translate it with babel fish or a program like it. There's a fair amount of information about it on the site, as well as on (in more logical words) on IGN (Here's the IGN article http://gameboy.ign.com/articles/708/708357p1.html)
All in all, I'm going to be keeping an eye on this, and I definetly want to buy it ^^ I'll update here if I find anything new.
Edit: If you go the download section of the site there's a neat gameplay movie that you can watch. My apprehensions about this are gone after seeing the sweet gameplay in action o.o
Edit:
Oh that is neat. Instead of a simple death system, there's a morale point system. If you get crushed in battle, your morale drops a bunch, but if you take down a ton of enemies with you, your moral only drops a little. Only when the units moral drops to zero does it dissapear, otherwise the unit respawns after battle. That's different, but cool.
There's also a really different movement system that I don't quite understand. Just have to wait and see ^^