You can read the full release on the BibLibre blog, or in pdf form. But the summary is, BibLibre are funding an additional 60 hours a month on top of what Catalyst already fund, for me to spend time on release management duties.
While this is a very cool thing, what I think is even cooler is that these types of collaboration are not at all uncommon in the Koha community. BibLibre and Bywater Solutions partnered to fund the work of the documentation manager for a while. Catalyst and Katipo have collaborated on a few projects, most notably the most recent Koha upgrade for Horowhenua Library Trust. Calyx and Catalyst have a very healthy working arrangement where we provide complementary strengths, and the list goes on.