Certainly not 3.5, although a few years ago I would have told you almost the exact opposite.
I wouldn't hold your breath. The issue tracker[1] suggests 3.7 or 3.8 as optimistic. Guido made some comment somewhere relatively recently, but I can't find where. It's entirely possible it will never actually happen; time doesn't seem to have made people more enthusiastic.
[1]: https://pypi.python.org/pypi/regex