In what is one of the most Vivendi "we don't know what we want to do" event, just a couple years later they then decided they wanted to sell their main french telecom company (SFR) and at the same time bought Gameloft and agressively bought Ubisoft shares (the two biggest french video games companies).
Too bad. I highly doubt Activision will ever release them. I tried to contact a bunch of companies via email, regarding the source code for EarthSiege 2, but never got a reply :(
If anyone knows anyone who worked on ES2 and might shed a light on some weird things I encountered during reverse engineering, please contact me!
After Zork: Grand Inquisitor, I really thought that Activision finally had a handle on the brand they bought, but then they just... stopped. Until 2009, when they licensed the IP to Jolt Online to make a crap browser game.
So I wouldn't expect much from Activision with the Sierra IP.