I was thinking of Artscow, so I'd get a set for $28, but wouldn't want to do that just to find out that new cards are imminent. If the future edition is not PnP but to be published at some future point then getting an artscow set now should be fine as I guess it could take a year or so before publishing, if you are going that route, but would be annoying to get my artscow set only to find out shortly after that there is a new improved version out there.
Yes, you are right. Probably next year the game is out if it will be published. However there might be an essen version available if all goes very well.