What started as a small/scale project to get people interested in IT, eventually became an enormous success, with several hundred thousand units already sold. The Raspberry Pi has been available for about a year now, but the large demand has caused several shortages in the past. Although the device is bound to get a successor, it will take a while before one is released.
In an extensive interview with Eben Upton, the developer of Raspberry Pi, ZDNet was told that there's no successor planned for this year. Through software optimizations, the current model should last quite a bit longer and Upton doesn't feel it's justified to abandon the 700,000 owners of the first version. When asked about competing systems he says he's not worried as those 'haven't yet shown their strengths'.