It would also make a really good platform for developing E3-specific applications.
Surely that's the whole point; otherwise it's just another Linux Arm development system. The attraction for me is that with the E3 you have the embedded ARM processor and a lot of interesting hardware attached to turn it into a useful appliance.
My ultimate ambition for the E3 would be to turn it into a point-to-point video phone... is that a realistic ambition?