Natively supporting Lua/LuaJIT and Python in writing asynchronous plugins, this alone is worth the wait. I am willing to give them A LOT MORE than 8 months if they can pull just this single feature off.
The request for Python integration has been sitting at the top of Vim's voting list for many years. It must be a very very difficult task, otherwise it could be done years ago. http://www.vim.org/sponsor/vote_results.php/
Other than the new plugin infrastructure, Neovim's GUI and embedding systems will be awesome. Anyway, I applaud people who explore and try to make progress (like from Vi to Vim, a natural process). In the mean time, I am happily using Vim which is both extremely powerful and stable.
TL,DR; I can wait.