IMO, Khan Academy needs to focus on maintaining their existing math and other courses, which they are struggling to do with their current small staff.  (If you appreciate what they offer, are you giving back, either with financial donations or by helping answer Questions in some subject area?)  Adding completely new subject areas seems like a bad idea to me until they are successfully able to make minor corrections to existing video transcripts in less than 2 months.

Could people go through both the calculus videos and the physics videos to get the needed content?

If not, perhaps you can find other online resources that are specific to Physics C.

It seems Khan Academy is finally getting a Physics C course. :) 

Hopefully they'll start launching it throughout the upcoming months

No way really? Tell me you're not joking

If they could make it happen before summer break is over, it would be epic.