The new DLC will not make your max in-game level cap go higher because of the upcoming patch on October 12th is going to raise the max level cap to all players for free from 61 to 69.
October 12th is also the date of Borderlands GOTY release and all users who buy the GOTY version will receive a coupon for Claptrap’s New Robot Revolution. I wonder if it’s gonna be registerable on Steam?
The new DLC introduces 6 new locations and modified deadly claptraps. If you’ll manage to complete the DLC in play through 1 and 2 you will get 2 extra character points and 6 slots in your inventory.