Hey all. I just put together Twisted 8.1.0pre2, because pre1 had a regression in IOCP. It's been fixed now along with some other updates. Please download it and test your software, especially if you use a non-select-on-unix platform! There have been some reactor changes in this release.
http://twistedmatrix.com/users/radix/8.1.0pre2/
Note that many of the files are still 'pre1', because they didn't need any updates. Only the main Twisted distribution, Core, Conch, and Words were updated.