Considering the BB was an email device first and it's still it's main draw,
HTML email for
BIS and BES is a must.
Faster processor, definitely.
More memory.
Keep
improving the camera. The Nokia N95 has a 5mp camera. Video recording would be nice.
3G all around. It would make for quicker downloads with a faster processor inside and make tethering on the GSM BBs tolerable.
I think to see the 8100, 8300 and 8800 form factors all with GPS, Wi-Fi and all the same features other then the camera would be great. Then the choice would be the form factor for consumers and business and government could go with the 8800s.
And keep the
8300 qwerty keyboard, it's the best RIM has had in a long time

.
That's my .02