I'm sorry "Mr. I know it all", but they will upload SG6 on PMC. They have a big fan base, they wouldn't be wanting to disappoint them and not releasing the map. Besides, youtubers play TV's maps, but not exclusive maps, but the maps for the public. And even though players could play SG1-5, he still made a public download for them. I could give you plenty of reasons on why they would upload SG6.
Return to your hive bee, this hive doesn't need you.
I have not heard anything about this that you/or other hasn't, but it is obivious that after Vareide‘s and Chad‘s discussion, Vareide now has an oppurtunity he might take, and in my eyes, I wouldn't be surprised if he took it. I mean, he is the owner of TeamVareide, and the orginal maker of the Survival Games. If he made a map and exclusively added it ONLY to TheHive, LOTS of players would go there to play it, and he could also do alot of extra commercial stuff to increase the player base. He could invite youtubers (we have seen people like CaptainSparklez playing all the survival games maps, and I think this would give Vareide an oppurtunity to make them come to TheHive for a SG6 match) to a match of SG6, add commercial stuff to his channel to get his subs over to the hive and try to make SG lovers go to the Hive generally to play the new map. He could also release it as something that is "not officially a SG (#), and then not adding a download link to PMC.
And when it comes to other builders, many is leaving MCSG for TheHive, and Biffington said something about they being much more supportive to maps and builders than MCSG, as his map wasn't noticed after months after it was released on MCSG and therefore he will release it over there. There has been rumours about the Teweran team going to the Hive and make maps for them, which is also a sad thing for this community. Teweran was in my and many others opinion the best build team (NOTE: Not necessarily at building SG maps, but building in general) we have seen, and their maps has been both beautiful and amazing.
I tried to make this as much as a "in my perspective" post instead of a rant thingy. I hope I succeeded.
EDIT: Reading a bit more of the most recent posts the case was much more clear for me, and I am sorry if I failed a bit when writing this. I'll still keep it here, because I have seen nothing proved...
EDIT2: I just found this. It is now proved that SG6 will only be on TheHive, as it was stated by Vareide himself.