I wouldn't expect too much public notice. The moment they announce a new line, their dealers will no linger be able to sell the old stock except at a big discount. They may tell their dealers but I wouldn't expect to hear a lot from them unless you have been buying from them for awhile. It's just good business.
Howhever if it helps, Bryston just brought out a new version of many of their consumer amps - the only thing that changed really was the cosmetics of the face plate. They also brought out a new pre-amp, the BP26, which is basically the same as the BP25 with a beefed up poewr supply.