Official announcement: (from the .com) Rise of the Samurai!

[Nigel]

I think the days of expansions coming on different discs are over unless its a stand-alone one.

Tsavong, you may well be right there. Now that the technology for it is there and buying on the internet well accepted, this will be the way of the future.

I think one of the reasons for doing it is, that it is probably easier to sell 10 small DLCs for 2$ each, than to sell one new CD for 20$. Not a bad thing for the customers either. This way we have more choice to decide which content we want and which we dont want. For example I may not be interested in getting another 10 new units with marginal improvements over the ones I already have (or are so overpowered that they get banned from Multiplayer games), but may like to play the new campaign. So I can buy the Rise of the Samurai for 7$ and give the SJ DLC for 2$ a miss. I get what I want for 7$ where otherwise I would have gotten it for 9$ plus some stuff I am not really interested in.