Whatever it is called 1.0 will almost surely be identical to b333, this will be just a name change.
So effectively, if you have played experimental until now, just don't do anything and play. You are in fact playing the 1.0
And whenever you feel like it, change to stable and you will have stable without any download or maybe 1 small file. If steam updates your client to 1.0, then you have to update your server as well I would guess.