We will be there for New Year's but we are going to sit this year out. 2 years ago we were on the VGF thread and they couldn't find the tree. Last year at SSR we forgot about the tree and it caused a lot of issues. We've just not had good luck with it...
This is so cool that there is already interest in the Christmas Tree Share for 2015. Usually what happens is there is a master thread for all of the resorts started (right about now in July). Tree Donors and coordinators are solicited first and then it is opened up for families to sign up for the trees.
Here is a link to one from last year: http://www.disboards.com/threads/12th-annual-dvc-holiday-tree-exchange-see-you-in-july-2015.3308993/