The Mojang team is back from vacation, and the first Minecraft 1.8 snapshot and the first snapshot of 2014 is here! Snapshot 14w02b has arrived, and it packs lots of awesome additions to our favorite game. The biggest improvements include three new stone types, stackable doors, major enchantment and anvils, a recipie for mossy stone bricks in suvival, improved villager trading, slime blocks, and much much more.The snapshot is available in the launcher, just make a new profile, click Edit Profile, and check "Enable experimental development snapshots." You can take a look at the original blog post by Mojang below. And remember you can always check when the next version of Minecraft is coming out on the right side of the page (or bottom if you are on mobile).
Source: Mojang