Update: DBM 4.10.4 and 4.10.6 have important updates for the new 4.3 boss mods. All 4.10.0 boss mods were based on PTR versions of the fights which were quite different from the actual live versions of these encounters this time.
This is the first release for World of Warcraft 4.3.x. There will be multiple release withing the following weeks as all new boss mods are still based on PTR data.
A complete (but quite technical) change log can be found on CurseForge.