Sorry about the Tupolev trip, but a bit more digging brought up this new piece of info. There is another Russian supersonic business jet on the boards, the Tu-444 which i believe draws heavily from the Tu-144 experience. This is apart from the Sukhoi Gulfstream JV which sukhoi is rumoured to be taking forward alone. This in turn is apart from all the western studies and proposals including one presented as recently as the Paris airshow. It seems supersonic people movers might return after all, albeit moving fewer and richer people. Will post more on supersonic projects of the future once i do some more research, including on the Tu-244, an apparent second coming of the 144.