Tamron has introduced an interesting lens, the 60mm f/2 SP Di-II Macro. I say interesting because it is exactly a DX equivalent of a very popular long-time full-frame favorite, the 90mm f/2.8. To be exactly equivalent, a lens has to have a 1.5x reduction of focal length (90 / 1.5 = 60) and a stop faster aperture (f/2 is a stop faster than f/2.8). Those two things are required to allow you to frame the same and get the same depth of field choices. We often get a lot of "near equivalents" of traditional lenses, but this is pretty much an exact equivalent.
So what's the excitement about? Well, the old Tamron 90mm was a dual-purpose lens. It was an inexpensive macro lens that was quite sharp for that use (see the end of my Nikon 105mm VR review for a mini-review), and it was a reasonable portrait lens choice as it was just a bit soft at normal distances at f/2.8. If the new lens emulates these traits, it, too, will become a low-cost cult favorite.
There are a couple of things not to like. The working distance is a small 100mm (about four inches), a bit less than the original, which was already tight in working distance. Also, the deep indent to the front element on the original acted as a secondary lens hood: the original was nearly impervious to flare issues, even without the hood attached. The new version has a front element right up at the front of the lens, so needs the lens hood in place. Still, this looks like a welcome addition to the miniscule DX prime lens lineup available. We now have a usable 35mm f/1.8 from Nikon and a 60mm f/2 from Tamron. We still need two more wides to round out a solid DX prime set (e.g. 17mm f/4 DX and 24mm f/2 DX). (If you don't mind manual focus, the Voightlander 20mm f/3.5 is an interesting alternative for the time being.) Telephoto options don't really need DX, so I don't expect to see much design action there; most expected future telephotos would cover FX as well as DX.