Kamen Rider and Gundam Variant, the doors they have are filled with a plethora of micro-collectibles. Though neither fandom is large enough in my heart to warrant a buy($27.70,) but its a cool concept. Though, normally I'll buy an advent calender and just restock it with new candy the next year, not sure where/how I'd find an appropriate amount of miniatures to restock this sucker.
Anyone interested can check out the pre-orders on any number of sites, though I'll just link you to Amazon.jp. The current release date is set to March 20th.