The lead plaintiff would change, but the lawyer behind this would still be suing on behalf of all those aggrieved parties who sold their stock before the announcement and therefore lost money when the stock rose later. If only they had known how spinning off the PC business would unlock shareholder value, they could have gotten what was rightfully theirs! Or something.
These shareholder lawsuits are little more than a shakedown. The lawyers (both sides) make out like bandits, the lead plaintiff gets a little taste, the company (or their insurer) gets screwed, and everybody else gets close to nothing.