If minor/feature releases are introducing breaking changes perhaps it's time to adopt accelerated major versioning schedule. For instance there are breaking ABI changes between 3.0/3.1, and 3.2, and while acceptable for the early adoption state of Python 3, such changes should normally be reserved for major versions.
If every 4th or so feature release is sufficiently different to be worth of an LTS, consider this a major release albeit with smaller beading changes than Python 3. Aside from this, given the radical features of 3.3, and the upcoming Ubuntu 12.04 LTS, I would recommend adopting 2.7 and 3.2 as the first LTSs, to be reviewed 2 years hence should this go ahead.
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