Andrew has said in the past that his intent is to provide a migration path from classic South to "South 2.0" which will backport migrations to earlier versions

Andrew has said in the past that his intent is to provide a migration path from classic South to "South 2.0" which will backport migrations to earlier versions of Django (versions 1.4-1.6, I believe) and also build on top of the migration infrastructure in Django 1.7. You should be fine sticking with South for now.