From their website:
Withdrawal from wagerr.com is optional. You may choose to leave your balance on your wagerr.com dashboard until the Wagerr mainnet launches in late Q4, at which time there will be a mandatory withdraw window.
If you do not choose to withdraw your Wagerr coins to Waves now, keep paying attention. Once the WGR mainnet goes live, you will have a limited window to withdraw from wagerr.com.
Wagerr Waves tokens can be sent to any exchanges that decides to list it in the future.
When the full Wagerr blockchain main network launches (estimated late Q4, 2017), intermediary Wagerr tokens on Waves can be redeemed at a 1:1 ratio.