One of the books that Wizards of the Coast announced that caused a lot of stir was the Guildmaster's Guide to Ravnica, as the worlds of Dungeons & Dragons and Magic: The Gathering were clashing together. The world of Ravnica has many diverse races, and WotC is looking to make sure their stats are right. So they're looking for your help. They've posted an Unearthed Arcana with the races for you to check out and give feedback on.
From the post:
A group of races from the world of Ravnica have arrived in Unearthed Arcana: loxodons, Simic hybrids, vedalken, and viashino. While native to Ravnica, these folk could potentially be used in any D&D world. They are destined for the upcoming book Guildmasters' Guide to Ravnica, out this November. Now is your chance to help shape their final forms!
Later this month, a survey will appear on the D&D website. Please let us know in that survey what you think of today’s Unearthed Arcana.