Moving from DVI to HDMI should reduce the size needed a bit, methinks.
I also hope they move away from USB and go with an ethernet port on the future product.
But mostly I hope they work out as many bugs as they can before releasing it to the public.
I'd rather have a product with fewer "nice-to-haves" that is more solid and less quirky than the 990 is now.
Specifically, make sure it doesn't make popping noises when switching surround modes, or doing anything really as this is annoying and potentially damaging to speakers...and quicken the amount of time it takes for the player to figure out what kind of audio stream it's working with.