Some cool stamps out later this year:
"Distinguished Marines"
"Advances in American Aviation"
"America on the Move 50s: Sporty Cars"
"Jim Henson and the Muppets"
The rest of the new ones (not out yet) are here:
Click here for new release schedule
FYI, you can buy pretty much anything the Post Office sells online, with a small fee for shipping; easily worth not having to stand in line. Recommended.