When will the Mindstorms NXT 3.0 on market?

To introduce my question here a short list about Lego history:
1998 RCX 1.0 2001 RCX 2.0 2006 NXT 1.0 2009 NXT 2.0
Today in the Mindstorms box is the same microcontroller, which was
introduced in 2006. That means, that the "intelligent" brain of Lego Set is 5 years old. The question is, when will Lego release an improved version. Perhaps with more RAM or something else.
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