http://www.pcgamer.com/blizzard-says-overwatch-loot-box-odds-have-not-changed/

Blizzard added more than 100 new cosmetic items to Overwatch's base loot box yesterday, many of which you can get a closer look at here. In the eyes of some users, however, the increase in available items was accompanied by a decrease in the odds of actually getting any of the good stuff. But Blizzard says that's simply not the case.

That's pretty hard to misinterpret, but Blizzard expanded on the topic a little further in a follow-up tweet. "Please keep in mind that unlike during events you're not guaranteed to get a new item in every box," it wrote. "These items went into the pool of all available items in the base Loot Box."