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Technically Python 2 isn't EOL till 2020, but it is unlikely that there will be any new features for Python 2, maybe bug fixes, but that is most likely it. Anyone dependent on backrefs on Python2 can easily just lock to the last major release, and it will be more than sufficient.
Most new releases moving forward will be to update for later versions of Python and new Unicode versions which will in no way impact Python 2. Feature wise, we are more likely to back off things than implement new features. As Python's Re adds new features, it may replace what we are doing.
Let's be honest as well, I'm pretty sure the actual usage of backrefs (outside of Rummage and wcmatch, which are both my modules) is pretty small.