On Monday, I posted on the Office Next blog about the experience from an end user perspective around apps for Office and SharePoint. Yesterday, I posted about it from the developer point of view. Tomorrow, I'll post from the IT/administrator point of view. Ultimately there are really three customers of this new model, and it's important to talk about it from all three points of view.
If you are a developer, be sure to take a read through the post, and definitely check out dev.office.com