I think it's a wonderful addition and perfect for travel/adventure photography. The Sony 50mm 1.8 was mentioned above for being a great value. That lens is also about half the weight of Fuji's 56 1.2 which really makes a difference when you're hiking miles into the backcountry. If Fuji's new lens is substantially lighter and maintain's the great image quality of the 56, i would definitely buy one.
Speaking as an outsider looking in on the Fuji lens line-up -
They're missing out not having a 1:1 macro IMHO and that's one of the (few) things that holds me back from switching over.
I need life size without the mess of adapters or extensions or weight.
Anything around 100mm (FF) would be good enough in my book and, like the CaNikon's, make a pretty handy close quarters portrait lens as well.
The idea of the 120 macro with 1:1 did appeal to me as a good tele lens / macro combination in the field, but
I see it as an additional macro, not the only one.
For the fly fishing stuff I shoot, a 16 1.4 , 35 f2, 56 1.2, 90 f2, 50 or 80 1:1 macro and something like a 120 would be awesome.