Magic 8-ball says......."Maybe".
My guess is this coming summer, perhaps with an announcement a bit earlier (at WWDC?) than the release of the product itself. However, that's purely a guess. I've seen someone guess around April or May, which would be a small speed bump, and then Clarksfield in Q4. It wouldn't be completely unreasonable if all Apple did was bumping up the spec of the base model to the next fastest processor, and re-arranged the price points of the current optional CPUs so that they're at a lower price point, but that's not what I think will happen.
It's all a guess anyway.