Nah, back up guys. it has nothing to do with modmaker or texplorer, 646 and 647 update dlc editor 2's manual unpack functionality. You don't normally use it at all. They're expanding the toolset to be able to create unique and completely new content, it will be under development for quite some time still.
As long as the tools you're using aka treescan, texplorer, meshplorer or modmaker don't get updated there is no real reason to update to latest SVN. Especially when you are building mods, stick with whatever version works for you until game-changing update that affects what you're working on enough to warant it.
I personally don't expect we need to update until K finishes the Texplorer and Modmaker overhaul and even that one shouldn't break older .mods as the unpack method during treescan and the way mods are created should be final, plus even if it wasn't K fully recognizes the importance of backwards compatibility and will no doubt preserve it.