Ripple names were implemented to associate your ripple address with your Ripple Trade account. You are able to send funds to other Ripple Trade users if you have their ripple name. You can continue to use Ripple names in Ripple Trade.
We want to provide maximum consistency for Ripple Trade users. If you migrate your Ripple Trade wallet to GateHub, each wallet will still be associated with a ripple name. New ripple names will no longer be available, but you can still send and receive money to the Ripple name.
For the time being, we will support both GateHub names and ripple names.