Any news about this?
The Steam Store Page still says it's to be released by 2018 September, but I'm guessing that's no longer the case?...
To be honest Dreadnought could be a great "filler" before the holiday season, which will more-or-less start around BFV release. But for that to work, it needs to be out before other, bigger fish stir the water, so it can get noticed.
By "filler" I don't necessarily mean a bad thing btw, it's just a game that people play when they got bored of current AAA titles, while the next ones aren't out yet. Same goes for War Thunder for example, and they are quite successful this way. It's just a game that people regularly return to for a month or two, and I'd really like if Dreadnought could do that as well... but it needs to gain a good initial momentum, so the timing of Steam release is as crucial as eliminating all the major bugs/issues by the time it happens.