Right now there's just small game add ons, but Lionhead is working on something else.
In a thread on their official forums discussing misconceptions about the current DLC, a Lionhead developer said
I believe (although don't quote me) each title can have a maximum of 1750 Achievement points. We are saving them for other things... No, i can't tell you what i'm afraid. --- ''Peace'' is a registered trademark of Smackdowner Inc. All Rights Reserved 2002 - 2011
I think DLC is the same thing as an expansion pack. No matter how big or how small the ammount of content from any downloadable peice of content, an expansion pack would always be considered DLC. So no need to use them seperately lol. --- Currently playing: Castlevania: Harmony of Despair, Fable 3, Assasins Creed: Brotherhood & The Sims 3 XBL: ShellmanQCM PSN: Shellman704