Apparently it's been moved up to 100, and 80 is still preferred [1].
I have a personal bias toward 80 because I like having multiple buffers side by side (100 would also work).
I always assumed that the hard limit on column length was as much excuse to reject sloppy merge requests as anything else: I don't mind a few 150 column lines, but if every single line has to wrap a 100 column buffer there's something wrong.
Amen!
Let's try to get rid of the "80 column limit" dogma and move on to more flexible and realistic limits, in all languages.