I have been using my six raspberry PI's (two newer gen 2 models) for quite a while now. The most useful distro for me has been openelec xbmc although I use wheezy and others as well. Currently trying wifi hot spot distro. I also have several mk802's but find the support and development for the PI far superior, especially graphics. The following are some suggestions for the next gen RPI model B. I would suggest this not replace the existing Model B but rather a parallel Model C for those who need more processing power.
1 - Dual Core processor with faster clock speed
2 - Upgrade USB ports to USB 3
3 - Increase USB power output for better support without needing a powered hub
4 - Increase RAM memory to 1 GB or more
5 - Increase GPU clock speed and cores
6 - Add Built in IR or RF remote sensor
7 - Better Audio output possibly change output to TOSlink or similar
8 - Add a micro SD card slot to support additional data or dual boot
9 - Add wifi support
10 - Upgrade network port to 10/100/1000
These are general concepts without any real feasability, licensing or implemention details. I know other devices such as MK802 already have some of these capabilities. Your comments, additions or suggestions would be welcome.
Thanks for listening