SEGA have set Feburary 2011 as the date for their “Dreamcast Collection” retail disc.
Basically its a compilation of their digital titles they have already announced. Here is something new though, it is also coming to PC, no Playstation 3 version! The press release does not say if Sonic Adventure version will come with the DX downloadable content on disc, my guess is probably not.
Source: Dreamcast-Scene