Source: The Wrestling Observer Newsletter
While nothing has been officially announced at this point, the plan for the main event angle heading into the upcoming WWE Extreme Rules pay-per-view, which takes place on May 4th at the IZOD Center in East Rutherford, New Jersey, is The Shield vs. Evolution. The angle was shot for this rumored match during the post-WrestleMania edition of WWE RAW this past Monday night in New Orleans. There was also a tease on RAW featuring Triple H, Batista and Randy Orton when Triple H said something along the lines of "when we're on the same page, we can't be stopped."
The actual match itself is unknown at this point, although it is expected that Ric Flair will not be involved in the Evolution side of things. Of course, that could end up easily changing.
The only question coming out of the angle shot at RAW, is whether or not Kane or Triple H will be the third person on the Evolution side, or if both are part of the equation and Daniel Bryan will be added to The Shield team to make it an eight-man tag-team match. Based on the RAW angle, one would assume it is the latter.