EX2 Blog has more on the POSSIBLE opening scene of Expendables 2. I must warn NONE of the info has been confirmed with a definitive source. Here's what they had to say:
A German movie site has taken the story revealed by the Japanese magazine - Eiga Hiho in an interview with Lundgren (story has not been officially confirmed nor the interview seen on any websites) and added more details to it: Schwarzenegger will only appear in the opening scene where he's rescued in Burma by the EX team, it could be an homage to "Missing in Action". The scene at the airport that also involves Norris & Willis is where he escapes after having been rescued (it was originally speculated that the scene at the airport would be the final battle and the closing scene). Willis then sends the EX team to a new mission (probably against Van Damme).
If true, the scene does sound cool but hopefully we do see more of Arnold cause I know we all don't want it to be over in one scene. I'll let you know if more develops.
Scott Adkins has posted to his Facebook page his own altered version of the unofficial EX2 poster, you can check it out below. It now includes pictures of both him and Jet Li.