I don't know if I'd call the Advance Wars games "accessable" after the first handful of missions. AW kind of kicks your ass around a bit.
Microsoft Picks Up Skulls of the Shogun
The gameplay will suffer without having a grid. An essential part of any turn-based strategy game is being able to quickly see how far you, and the enemy, can move. Taking away that precision of unit placement and there is a real danger of it becoming a mess of fiddly blobs of units.
I'll take a fresh look at it when it comes out, as I love TBS games, but so far this looks nothing special. Certainly nothing to appeal to a huge Advance Wars fan like myself. For one thing, the story and the characters will need to be better than generic skeleton dudes floating around. Presentation will be everything.
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