In addition to the recent 1.8.2 update for the Xbox Live version of Minecraft, there's even more content showing up soon. Specifically, a third character skin pack is set to come to the popular sandbox game. Like the first two packs, this one will contain quite a few new skins for Minecraft characters from other media, including content based on the Half-Life series and Awesomenauts. Sure, you could dig a hole as a dwarf, but why do that when you could do the same thing as a headcrab zombie?
There's no information yet, unfortunately, on when the update or the skin pack are coming out; both still need to finish going through Microsoft's certification system. But we'll expect to hear from Mojang and Microsoft as soon as the skins are ready for purchase -- probably in just a few days from now.