False, Empire Total War and Napoleon Total War had as much official mod support as TWW will get: little to none.
Despite that fact, ETW has dozens of hosted mods on this site, and hundreds of other mods on this site. Napoleon has about a dozen hosted mods and
The Great War mod. And these two games were made on the same engine as TWW.
Now as for the unit roster, it's not the best, but I am going to wait until we get more information before judging.