I'm pretty sure just about every one of us is going to feel the same. It'll be nigh impossible to surpass The Dark Knight. Heath Ledger completely reinvented an outrageous character, and made him become a complete and utter psychopath that you fear just very well may walk this Earth.
Still, I remember very clearly how most everyone cast doubts that TDK could surpass the excellent Batman Begins, and whether or not Ledger could really pull off the Joker. I believe we all agree that it happened. Not that it's likely TDKR could pull it off, but just a lil perspective. Anne Hathaway in skintight leather is going to help, though.