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There's no so much time left before feature complete phase.
So if we wanna have this feature in D8 we need a clear roadmap and a list of tasks.
Splitting this into a doable amount of is only way to make it real.
1) Comment Entity - done, needs some clean-ups and optimization
2) Comment Field - done, has follow-ups for counter part (statistics and history modules integration)
3) Views integration - done, but sometimes has fails and fixes in re-rolls
4) Tests - done, supported
5) Upgrate path - partially, in progress of optimization
6) Theme layer - in progress, templates for wrapper an others, twig
Issue to test patches