We also ask that you remember that the Raspberry Pi is ultimately a charity project. As much as we'd like to put a dual core processor with 2 GB of RAM, 6 sata ports, and USB 3.0, we can"t. We certainly want to hear what you"d like on future boards, but please don"t be rude or unrelenting on demanding it if the response is "not at this time." Our first priority needs to be to the getting the Raspberry Pi into the hands of children who need them and we ask for your understanding if that need means we chose a item you disagree with or don't chose an item you really desire.
I'd hope the spec remains static for some time to provide a stable development platform.
Ok there's still some work on the arm linux distros and a lot of work on software side but without hardware changes, in 18 months Rasberry Pi could develop into something.
If I did have an idea for a model C it would be more a PI squared: Take 4 raspberry PI's and slap them all on the same board with power supply and network connections between the 4. For people who want more than one PI they could buy 4 together like this. They could experiment with networking, and client server, active/passive.Configured the right way 4 regular spec PIs could be better than an uprated PI. If wanted 4 individual PIs for diferent projects could just snap the board both ways along perforation and solder on NIC connector (+ HDMI if required) as only one of the 4 connected PIs would need a HDMI socket. Only issue with this I see: you really need a hub for 4 PIs networked together or can the broardcom chip run 2 nics so each PI is connected to 2 others? (would be little expense as no need for nic sockets) (OK im introducing changes running 2 nics, maybe there's a cleverer solution over USB? maybe someone can dwell on that?)
Regarding the original model B spec. I think its as good as could be done with today's technology. more speed would have meant more power and keeping power down to 500-700ma is something that had to be done. Only thing I don't much like (although this contradicts my PI squared comment). Shape of board ....Would have been nicer if the PI were round and CD shaped inc central hole so an old CD spindle could have been used as a case rather than a cigarette packet. ......Well you did ask about future boards...