Since some hours ago global 18_STABLE version is "2007021403" and HEAD is "2007021500".
While this isn't critical I really think it's highly recommended to keep them synchronised, in order to be able to perform some updates properly without getting crazy with extra-checkings. This situation should be maintained at least until release of 18_STABLE.
So I would:
1) Raise 18_STABLE to "2007021500" (I think it can be done safely). Call it Beta2.
2) Put a note in HEAD about to keep it in sync during beta stage.
Just one idea. Ciao