Being frustrated on this still not being in place as of February 2015, I asked @SF311 on Twitter, "Hi! Any word on the long-promised NW-SW crosswalk at Fell & Gough? Intersection remains a safety problem." and received this reply:
"No ETA unfortunately. You may want to ask BSM @ 415-554-6920 or Mayor's Office On Disability at 415-554-6789. TY ^JM"
I called that first number and got transferred within BSM, but turns out for crosswalks you want MTA. So, I called 415-701-4500. I was on hold for a while, but with ok jazz in the background, so not awful. :) They suggested I follow up with Maurice Growney and transferred me to his voicemail (his number is 415-701-4549) where I left a message.
I will add another update when I hear back from him. I'm hopeful about his response being useful, if not necessarily good news, as he was so helpful in 2013.