Hi all - I don't check Bitcointalk often, if you want to stay up to date on this project please join Discord or follow the weekly update series on Medium.
CoinExchange expressed their intent (in private communication) to support the WYV ERC20 token, but they have not ported user balances and reopened the market yet. I've offered whatever technical support they need; they may simply be delayed by other non-Wyvern related platform issues (their Twitter mentions some DNS snafu). The exact timeline is up to them, not me - if you want more information, contact them and ask.
The old Wyvern blockchain will not be supported by the Wyvern development team, and I do not know of anyone else who plans to support it - so please do not mine past block 315000, those coins are likely worthless.