Questa è la mail che mi è arrivata da cexio, da quel che ho capito fanno tutto loro.

Are You Prepared for August, 1st?

As you know, on August, 1st, a a BIP 148 UASF (a user activated soft fork) will be activated to trigger Segregated Witness. The release may result in a chain split. In this case, it is highly important that your coins are split correctly. Otherwise, you can lose funds.

Coin Splitting Without Any Hassles

CEX.IO has been actively preparing for the SegWit. If the chain split happens, then we will split your coins correctly, including the creation of new private keys and new wallets.

You are welcome to deposit your Bitcoins to your account on CEX.IO exchange, better 12 hours before August, 1st, 2017, 03:00:00 GMT+0300 (EEST).

Limitations for Bitcoin Deposits and Withdrawals

We also inform you that we will disable Bitcoin deposits and withdrawals in 12 hours before August, 1st, 2017, 03:00:00 GMT+0300 (EEST). Deposits and withdrawals for Bitcoin will be enabled again after a certain fork is supported for sure.