Yes, April 1st is the release date for Dawn of Fantasy on Steam, and, no, it's not a joke
When Valve first suggested the date to us, we were like "you're kidding, right?" and thought about changing it, but it fits in with their release schedule and let's us get in maybe one more patch before release, so it's probably the best date on offer.
Anyway, it's not long now. We'll be sending out another newsletter to remind people when it releases, hopefully enticing a few players back.