The guys ‘kidnap’ Leonard to take him on a bachelor weekend. Sheldon is lured on this trip because the van belonged to Richard Feynman. He adores Feynman as we know. They are also going to stay in the house he once owned in Mexico.
Check out this video with Jim Parsons on mtv posted in March this year. Jim talks about how he'd like Big Bang to end and it's interesting what he excludes, as well as what he includes. He's still very firm on not wanting babies on the show as well.
Cold open has Leonard dreaming about Sheldon and Penny sharing a passionate kiss. Yes, you read that right. Another dream sequence of Shenny. Unofficial information from someone at the taping suggests this is a HOT scene.
According to yibada.com they are going to use the same storyline they used on Leonard and Penny when he dated Priya in Season 4. Penny pined after Leonard while he was involved with Raj's sister. This season it will be Sheldon and Amy's turn.