[megablast]

Two reasons for this, that I can see. To take mind share away from Apple, so they do not get too big before anyone else has a chance, and to signal that they are actually doing something.

Tablets take a while, to design, get software going, and source parts for those big screens. Everyone is running behind, and running scared. They are not taking as long as they did to respond to the iPhone.

One thing it is going to come down to is the software, which all of these new entrants seem ignorant of. You can come up with any hardware stats you want, nobody cares about that. Sure, a camera can be useful, but the rest, who cares.