Will there be a toolset/ editor for Van Buren?
No
Q: Why not?
Creating a suite of editors for the gaming populous is far more of a challenge than creating them for game developers. Game devs are used to using command line tools, and esoteric interfaces. Plus it's our job. We have to use the tools given us. If we release those tools as is (assuming we decoupled the editors from the database and fileserver) the percentage of gamers that had the desire to use the tools AND of those had the time to use the tools AND of those had the drive to learn to use the tools AND of those that actually finish a mod...
Q: Is there a chance that somewhere down the line that after the game is released, a toolset might be released?
I don't know, but I'm 99.999999% sure that if I ask I'll get a response of, "Maybe." I would definitely hold off on asking until after the game is out.