The Darkprism microtransactions are perfect for any cosmos enthusiast out there. With it you look like some alien robot that came out of the future and you are ready to take down poor Hillock. The Wings from the set also look great but the Portal is actually amazing. The whole set costs 420 points, 190 for the Wings and 180 for the Portal.
You can also now buy the Furious hideout, which is pretty much the arena where you fight Kaom in Act IV. It is always awesome to have hideouts like this one but keep in mind the space you have is relatively limited.
We also have a sub-hour cut from Exilecon where Ivan Leong talks in-depth about the creation of game effects for Path of Exile.