What happens to 0 confirmation accepted sites with the new BIP?

[thejaytiesto]

I remember reading about a new BIP that would make 0 conf obsoletes, meaning that 0 confirmations couldn't be spent or something like that, I think it has to do with the "replace by fee" new feature (BIP65) im not an expert so im not sure.

I just want to be sure that if I send money to a site like bitcoinvideocasino that accepts 0 confirmations everything is going to be OK or I will face some problems..?

[RHavar]

The new feature is opt-in, which means on a transaction by transaction basis you explicitly say "I might double-spend this".  So for a bitcoin casino that currently accepts 0-conf transactions, you just need to not opt-in to the ability to double spend, and they will process your transaction exactly as they do now.