Delegates wackou and btstools.digitalgaia on the BitShares 0.9.x network will support BitShares 2.0 by going offline when the snapshot for the genesis block of BitShares 2.0 is taken, currently scheduled for 9am EST on 13 Oct 2015.
When the BitShares 2.0 network comes up shortly after, they will come back up as witnesses, probably merging them into a single one at a later stage.
Eagerly waiting for the next testnet!