I doubt it. you just need to be sogned online for the living towers. You wont be playing anyone online so i think long as you have a connection they will update.

xD I thought ig might have been needed because of the faction war pts and stuff

Since you can complete the towers and faction stuff offline, I doubt you would need PS+ to play that content.

Yea living towers would be in the same category as game updates and patches. You won't need PS+.

That being said PS+ is ridiculously good for what you pay. But that's coming from a PS3/PS4/VITA owner

Yeah I was wondering this myself. Hopefully you guys are right, I bought a year long PS+ Card for MKX but im probably not going to activate it on launch if this is true, ill do all the single player stuff first then do it.