Dont put your funds in coinbase guys, you are not going to receive those free coins, and if you receive them, there is not going to be replay action which means that you are not going to be able to spend those coins without spending your bitcoins first.
It is a risky desicion, i received that email too and i doubted to put all my funds in there to receive those coins too, but i know that all that process is useless, and coinbase is a shitty wallet, it is not worth your time and your funds of course, because it can be shut down at any moment too.
What wallet should we put them? I don't know which wallets are supporting segwit2x coins after the resurrection.