Those little pesky--and often missing in slovenly writing-- 's things, not to mention missing commas, can give you a real headache.
...the smart money is probably still on P being different from NP...
...the smart bet is probably still on P and not on NP as being different...
...the smart money is probably still on P's being different from NP...
...the smart bet is probably still on P's (still) being different from NP...