Honestly... the cynic in me thinks this is just someone who has managed to steal "aquire" a wallet.dat from somewhere that has "several" BTC showing in it, but they obviously lack the password and sufficient hardware to attempt to crack it and they're just attempting to get someone else to do the heavy lifting to bruteforce the password...
i have seen very similar thing posted on bitcointalk (services board) and also once elsewhere claiming they only have this hash and want it be cracked. there is a good chance that someone is selling this on the internet with the promise of a very high reward inside if they break it.