It kinda strikes me as odd that the isleaked website was registered two days before the incident. I'm not putting my email in there. Who knows, it might be a huge advertising scheme.
Plus, google locked out all leaked accounts. There is no need to enter your email on these sites. Google already locked all leaked accounts, so you'll know by logging in.
Source:
http://money.cnn.com/2014/09/10/tech...ack/index.html