As posted on IU's Facebook, dates have been announced. This is on the official site:
Enjoy a helping of Wholiday cheer:
Take photos with Grinch and his dog Max and make it a Grinchmas to remember
Join the Backlot Whobilation as the Whos sing and dance though Whovile
Stand beneath the towering 60-foot Grinchmas tree and soak in the festive Park décor
So....no mention of a snow playground this year or nightly tree lighting show. Pity

at least we still have a tree.....not much beyond that :/