I have no idea but wanted to add one little piece that I do know:
We tried to schedule surfing lessons at TL for September and we were told that they had canceled all surfing lessons until after the first of the year as the "wave maker" needs to be recalibrated and this can't be done until the shut down. I guess they have to drain it?? Sounds like TL will be shut down first given what the CM said.
**EDIT**
Nope, I was wrong on who goes first! This is what I just found over at allears:
Blizzard Beach
Blizzard Beach will close for annual refurbishment September 28, 2008 through October 25, 2008.
Typhoon Lagoon
Surfing School Changes at Typhoon Lagoon: Surfing classes and private surfing events at Typhoon Lagoon are not available until sometime in 2009. Maintenance needs to be performed on the wave mechanisms during the regularly scheduled winter rehab. The wave pool will continue to operate for guests. It's only the surfing waves that will be offline until 2009.