Officially there is no connection to steemit (new github repo and new account to announce this).
As this is a soft fork, the assets are not really frozen (this is only possible with a hard fork which receive consensus), but broadcasting operation that move the assets is only possible when a witness with <= 0.22.5 is signing the operation on all targeted accounts.
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Sun's sockpuppet accounts are supporting this though, and unvoting the witnesses who aren't upgrading.