Today this B2X hard fork has launched: http://b2x-segwit.io

But they are not the same people behind Bitcoin Core , and there are just a bunch of exchanges that support that, and that suggests me this is not the official  fork.

So we are going to have 2 different Segwit2x currencies ?

And most important: if we have BTC on our local wallet, how can we claim these B2X ?
There seems not to be any info.

If Yobit and HitBTC were able to automatically give B2X to BTC holders today, we must be able to claim B2X manually by ourselves as well, as the
 claim procedure should be the same for anyone who has a private key.