Interesting, so they are suddenly bringing out many C-batches out of the magic hat now?
If I may speculate a bit, Intel tend to bring out good batches whenever they want to push the marked for more sales. They did it with w3565 (If I remember the model# eight) last round. They kept some good week-48-batch# in storage for over 1 year and used it in w3565 to push new sales, in last round.
Based on these speculative logic, Intel may be trying to regain some marked that has been shattered by failing MBs. Anyways, I hope we can see more of these C-batches in action soon.