I would imagine that the E+ announcement is being withheld until the carrier releases further information on aircraft configurations going forward. It would make much more sense to discuss E+ when they determine whether the carrier will be two class/three class/mixed two and three class, which hard products will be retained, and so on.

Today's announcement was for the 2011 OnePass/Mileage Plus program changes. While E+ is a benefit for elite members on both carriers flying UA metal, it is an extant product and access to it hasn't been modified. I wouldn't have expected an E+ decision to coincide with FF program integration unless it was part of a larger rollout of products and services.