This is pretty big.
"Microsoft has tapped Ivar Jacobson, known as one of the fathers of the popular Rational Unified Process (RUP), to lead an effort to deliver a lightweight unified process to the Microsoft Solutions Framework.
...
Jacobson said the first fruits of his company's relationship with Microsoft will be through the delivery of the Essential Unified Process (Essential UP), which is based on the Microsoft Solutions Framework and integrated with VSTS. "