The old battlesystem played poorly (magic and enchanted creatures were poorly thought out and implemented), hopefully this works out a lot better. I'm especially curious to see how they handle "units" of wizardly creatures and calvary (not just horses, but the stranger stuff like hippogriffs, pegusi, wyverns or even stranger beasts).
Also, having had some experience with WHFB, using a grid system for formation style units sounds atrocious. We'll have to see how this ends up playing out - and how well it's supported with mini's, pogs or whatnot (Battlesystem's cardboard counters sucked, as you had to move them individually, instead of like WHFB's movement trays).