The three new armor skins are the Primeval, Krytan, and Profane armor sets, all of which appear to be the GW2 versions of their Guild Wars counterparts. Each set sells for 500 gems. Also on sale for the low, low price of zero gems, is a GW2 baseball cap.
A little puzzling, though, is the removal of extra bag slots as a salable upgrade. In previous betas, you could purchase additional bag slots, but they were not sharable between characters. Does this mean ArenaNet is reworking things so that you’ll only need to buy a bag slot upgrade once and have it apply to all your characters? This hoarder hopes so.
Finally, we’ve heard that you can upgrade from the Basic Edition of the game to the Digital Deluxe Edition for 2,000 Gems, even though that isn’t apparent on the Gem Store’s web interface, which can be found here.