Unearthed Arcana gives Wizards of the Coast a chance to give you a look at what they're working on for D&D and do a little playtesting at the same time. This time around, it's Giant Options. No, you don't have to be playing a giant character in order to take advantage of these new options.
From the post:
In today’s Unearthed Arcana, we explore character options related to the magic and majesty of giants. This playtest document presents the Path of the Giant barbarian subclass, the Circle of the Primeval druid subclass, the Runecrafter wizard subclass, and a collection of new feats, all for use in Dungeons & Dragons.