This jump is short covering. The frenzy will reverse tomorrow.
You'd think Microsoft was buying BKS by the reaction to the news that MSFT is making a joint venture with BKS. A desperate ploy by BKS for some cash infusion to stay alive / a chance to adapt or die.
Take the money and run. If you have any BKS stock, now is the time to sell. Thank MSFT for the nice exit point.