I have a New Year 2019 Reservation and this is what I received:
The pool and water slides at Marriott's Lakeshore Reserve will be closed for resurfacing from January 2, 2019 through February 22, 2019. Owners and guests will have access to the pool at the JW Marriott Orlando, Grande Lakes and the Ritz-Carlton Orlando, Grande Lakes during this time.
It’s very often too cold to swim in Orlando in January and February. At least they picked the right time of year to do the rehab