according to Apple’s new TOS, can we still send upgrade to an existing app using Unity? Because I’ve created an app past year and now I am going to make an update, so I was wondering whether I can do that or not?
As I see this ToS really gives a lot of problems for everyone.
It would be best for someone from Unity that say official announcement about it.
Thus it is filled in the fog and not specific provided. I think that the official position about this from Unity is emergency.
You can send in new upgrades no problem 
and UT can’t make any official announcement as this is an Apple thing and apple does not hand out any official statement