Stardock did alot of work, post release, for multiplayer.
We got 2 new demigods for free (but there was artwork of them during beta. so they were in the works since then.)
It's been a long time since the game came out and I imagine there are not many new purchasers, so financially (GPG is a buisness afterall) there's probably not much incentive.
GPG is an independent company (I believe) so there's no one but themselves to tell them not to post to us about the state of demigod. It seems to me Demigod was a side project, a template for sup com 2 (graphically/map wise). But I bought it as a full game. I wont buy another GPG game. Demigod could have been something, it could have been a contender but now it's almost nothing.