That was the headline of a an email from Serengeti Watch I received yesterday. Shocking news, but it seems that the Tanzanian government has actually changed plans.
According to a posting on Serengeti Watch's facebook page, the road will be built, but AROUND the Serengeti. The poster is furthermore saying that the news about the redirected highway was already on the TV news.
UPDATE (03 Feb 2011): no updates on the highway so far... only contradictory news from different sources. Pls follow the facebook page of Serengeti Watch for more updates.