This video preview (provided by Curse) offers a look at what the Barbarian armor sets are going to look like in Diablo 3. The video begins with the starting Barbarian model (i.e., no gear), then progresses slowly through all of the armor sets, finishing with what is likely an Inferno set. In all, there are 17 armor sets previewed.
These sets are accurate only for the Beta, so keep in mind that they could change prior to the live release of Diablo 3.
Diablo 3 Barbarian Armor Set Preview