The new potions could be created by the player in-game, given a sufficient alchemy skill. There are two versions of most of the potions - the cheap random loot version is priced like a homemade potion and the "grand" version can be purchased in stores. There is also an automatic potion brewer which will create the potions for you if you have sufficient skill and the right ingredients. There are three alchemy recipe books and two "elixirs" - potions you couldn't make in-game, but that makes sense (restore all 8 attributes).
Comments / feedback / suggestions welcome.
Edit: Download from PES here http://planetelderscrolls.gamespy.com/View.php?view=OblivionMods.Detail&id=4987.