I went to get mine this weekend.
Arrived at 8.30 at Alto Avellaneda shopping mall on saturday. At 10 they opened the doors of the mall, and there was a bunch of people waiting in a queue already. They give out 60 numbers per day, in 15 minutes increments. You must just return at your time slot, and everything gets taken care of in 10 minutes at the most. Its supposed to be delivered by mail in 2 weeks.
Mind that the place itself had signs that they weren't able to do "Extranjeros", I dont know what limitations there are.
BTW, you need to charge (credit or debit card) and cant pay cash. I got the new DNI (card+paper) plus passport (that lasts 10 years) and I paid around 265 bucks for everything. I believe that prices were supposed to be 315 but for some reason they weren't updated in their system, so they just charged 265.
There are a couple of this "quick documentation centers" around. They work saturday/sundays and even holidays. I was able to do everything just by showing up with a DNI, and so was my partner.