This looks to me as a. the withdrawal of one attorney from one firm who still has 4-5 attorney's on the case, i.e. the firm itself is still representing Activision and b. the addition of a new attorney from a different firm with experience in patent cases and settlement.
Worst case: Tactic to seek delay to get new counsel up to speed.
Best case: Settlement discussion are positive and this attorney's talent is needed to make the deal.
This should become a lot clearer with the joint brief on scheduling of Markman which I would expect in 1-4 weeks.
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