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The water parks alternate the months they are closed during the cooler months. So if Typhoon Lagoon was closed last year during your trip, then it should be opened this year and BB will be closed.
But this is all speculation based upon what I know from my past 3 vacations during the winter months. And the water parks were alternating each year, for which closed first.
I'm not sure about the usual water park operating schedule for fall/winter months, but in 2002 I think Typhoon Lagoon closed for rehab. It went down for a couple of months (I don't remember when it went down exactly I think like late september or october or something). Then it reopened in late december.