Even if the payments are less, the duration will definitely be increased. The 2012 you drive is not worth the same as the new 2013 on their lot. Do not look at the payments. Instead, you should be looking at total out of pocket over the life of the contract.
As for your question, here you go:
http://www.camaro5.com/forums/showpo...81&postcount=1 . Hill start assist is standard for all manual 2013s it seems.