Until they give a release date, the Maven is vaporware.
To my knowledge, the Maven hasn't been spoken of by Coralvue since April or May. Coincidentally, that's around the time the Apex Neptune NP was released. Clearly they only announced the Maven so old customers wouldn't jump ship and potential customers wouldn't be swayed by the Neptune.
The statement back in May was that the Maven will be ready when it's ready. That seems to be the rallying cry for the Hydros fanboys when anyone asks for an update. They're commending Coralvue for doing proper testing prior to release, as if that's some sort of novel concept.
I think it's still six months to a year away. If it was coming any time soon there would be some fanfare by now. Instead there's just silence. There hasn't even been a video of the device running a test in a controlled environment yet. If they can't show us how it works by now then it can't be coming any time soon.
A couple of retailers state that it'll be released in Q4 of this year, with one saying it's "announced" for November but with no source. At a trade show, one of the Coralvue guys said they'd like to get it out by Q4 of this year but didn't commit to that.