This came up on Tactical Command, since it relates mostly to Epic. However, some other items are affected, such as Warmaster. Forge World appear to be winding down a number of lines, Epic and Warmaster amoung them. No notice was given about this, and some things have just been removed from the web store. The latest word is that certain, less profitable, lines are being withdrawn and only current stocks will be sold. Once they are gone, thats it. There is a small chance of a reintroduction after an evaluation, but I wouldnt hold my breath.
If you want stuff from FW, get it while you can.