Ngmoco is wasting absolutely no time in taking advantage of the new policy allowing developers to release free apps with in-app purchases. Aside from announcing that their Eliminate game will be free, they have also released Rolando 2: Chapter 1 into the App Store for free.
The free version of the game offers the entire first chapter of the game and offers the remaining chapters as paid in-app purchases. So you can buy them as you need them.
The game serves as a Lite version for the game, but the Full game dropped from .99 to .99 [App Store], bringing it in line with the total cost of buying all add-on packs.
App Store Link: Rolando 2: Chapter 1, Free