I've gotten a Happy Box twice now, both times were totally worth it.
They are filled up with items that didn't sell out entirely so many of the boxes do have same or similar items - once people start getting their boxes and posting the contents, you'll have a good idea of what you got. Last year I played a game and I guessed what items were in my box based on other fans' posts... There were 8 items, and I got 7 100% right, including the color lol
This one will probably mostly include items from CDL 13-14, PREMIUM SHOWCASE ~Feel the love~, and a-nation 2014, with a couple of things from 15th Anniversary TOUR ~A BEST LIVE~, and a-nation 2013 probably.