A decision on how to integrate SegWit into the current system at CG wont be made before the bech32 standard is fully rolled out.
Right now, using bech32 addresses can cause two big issues, the first one is that some users are unable to deposit, since their wallet/exchange doesnt support sending to bech32 addresses,
the second one is that users might not be able to withdraw everywhere, as some exchanges don't credit transacions sent from bech32 addresses.
In the interest of avoiding either, a switch to bech32 segwit addresses on a service level doesn't seem smart before both those possible problem sources are addressed.