Ok... now, if I read my internet forums right, it looks like the new editions of Battletech will NOT be using the classic "Unseen" designs from the first few editions of the game. It simply appears that someone in the legal department of someplace or other goofed, and spoke before all the facts were in. Apparently, Harmony Gold holds the rights over those designs. You make your own conclusions.
I don't know how this affects the new 'MechWarrior' game that recently had an AMAZING trailer released. In the trailer, we can clearly see a Warhammer mech, which originally was a Tomahawk Destroid, from Macross. Will it happen, now? I'm still looking into it, but the preliminary impression is 'NOPE!'
Again, I could be wrong... If so, feel free to correct me.