Well, if it's a preview why isn't it available for free?This is actually a preview of the upcoming Dungeon Delve book. Its decent for what it is and I may have to pick up this book when I need something in a pinch.
Spring hasn't been covered.The M&M Annual has something like this - four adventures on two pages each. I've been thinking of getting something like that for fantasy gaming for a while now. Dungeon Delve might fit. Looks awfully linear, though, but that might be the nature of a four-hour delve.
Also, Tulani of Summer rounds out the eladrin noble season set.