Confirmed by Dave Meltzer, there will be a July 19th UFC at the Palms in Las Vegas featuring:

Anderson Silva (debut as a light heavyweight) vs. James Irvin

Hermes Franca vs. Frankie Edgar

Might as well have Silva fight at 205 because he hasn't proven to be a draw at 185.  His fights at middleweight have continually underperformed similar marquee stars the other weight class and has yet to have broken through as true draw.

Perhaps exposing him to the public against high-level 205 competition could accomplish a lot good - including improving his drawing power at 185.

Source: Figure4Weekly