As many as we got
Seriously, Bethesda never released any tools for exporting meshes or skeletons from a modelling package to .nif format, and they never released any tools for converting animations or incorporating them in the game. Everything that was produced was by using the modder-created NifTools software, the Havok publicly available software, some other modder-created tools... and, as you say a lot of duct tape, wonderglue, mutfuit, corn and tatos .
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It would be wonderful if modders got more from Bethesda this time around, but firstly there is a lot of licensed middleware in their tools that they can't release, and their in-house tools are likely to be fairly gimcrack and unfriendly.
Based only on past history, I'm glumly expecting it will be up to the community to develop any tools, which depends on there being people with the time, expertise and interest to devote their spare hours to reverse-engineering and coding.