It seems as though GW is going to bring back some of its old models through its online store. While this rekindles memories of the old mail order system from some years ago, I doubt that it's going to go as far as that. Indeed, so far, it's just a small range of Imperial Guard models which have been made available. Hopefully, the idea will take off and be expanded, but I imagine it will be highly dependent on the performance of initial sales.
I'm somewhat surprised that GW is able to do this, as I was under the impression that all the old moulds had been destroyed a number of years back. This is clearly not the case though, so I'm very curious to see what any future releases may be.