According to refurbishment calendars, the annual Blizzard Beach refurbishment has been pushed back to January 18th, reopening on the 19th.
As a result, Typhoon Lagoon will be starting its refurbishment on January 19th as Disney staggers the annual refurbishment schedules of its two water parks.
Blizzard Beach has seen an extensive refurbishment, including the full replacement of the Summit Plummet slide.