I've said this before, but I'll put it down here just to be official.
I love where this technology is going, but a more standard form factor would definitely make the packs more appealing to myself and others. It would just be easier to fit them into our vehicles, simple as that.
Personally I'd like to see higher capacity cells. I realize that smaller size and higher capacity don't exactly go hand in hand, but I hope some progress can be made in this area anyways. Even higher capacity without a decrease in size would be nice.