its almost 2nd week of february and still no black for 620, and hey, i think they name the update in black color because it will be the last time that they (Nokia) are going to work on a phone firmware. you know, Black = Dead .
I would say most likely as an answer to the topic name, but they probably are working on it. I hope there's a good reason for the delay (as in some enhancements for the 620 - battery).