When is the next code jam and/or how long will it be till the next one
the jam right now has ended, but the judging has begun and is still in progress; there are more than 100 submissions so this is gonna take a long time lol. The next jam will probably be at least after 1 month (for judging) but it might not come right after the winners for this jam are announced, just to give some time in between.
also I think that some people on repl.it can also make jams themselves if enough people are interested (not sure tho)
meanwhile, you can always do the weekly challenges; just go to the announcements board and scroll a bit. here is the latest one: https://repl.it/talk/announcements/Weekly-Challenge-17/52508
So yea might be a while till next jam ;)