In short they announce that there will be free patches that will add features to the game for everybody that buyed it. The first one will come out in february and will include the hot seat mode and three skirmish maps for it that can be played also in single player mode.
"Akella inc. and .dat studio are proud to announce the developement of serries of content add-ons for Disciples III: Renaissance. The first one is already in developement and will include the "Hot Seat" game feature. Hot Seat is a traditional for the serries multiplayer mode that allows several people to play a complete skirmish game on a single computer. The content add-on will be distributed by the in-game update feature and will be provided for free to anyone who has a licensed version of the game. The update will further include three skirmish maps for the Hot Seat mode that can also be played in single player mode.
The first add-on for Disciples III: Renaissance will come out in February 2010."