The pool reopened at Jambo House in early November (it was open November 4th). We walked by it on the way to Mara a couple of nights ago and people were in the pool despite it being around 48 degrees out.
As to when the resort is decorated, once we went to
MVMCP on November 17th and came back that night to semi trailers parked under the porte chochere and the next morning Jambo House was fully decorated. We went over to Kidani the next day and it was decorated too.
I guess we have never stayed at AKV in December before where the weather is often up and down in temperatures. We noticed that once the temps are below 60 the zebras and giraffes are taken in at night. When it gets below 50 degrees the antelopes, cattle and even the birds are taken in at night and they are real slow to come out in the morning. Even when the food truck comes around the animals are hanging out at the barns until the temperature gets back up to 55 degrees. Thank goodness we are not experiencing the really cold weather like they have had in the midwest and east coasts.