Once in awhile, they do have bug fixes for CS6. The only thing I can think of that was an upgrade for CS6 was a newer version of camera raw. For now they are allowing CS6 to have the latest version of camera raw, but when they are done with supporting CS6, I imagine that will be the last of the upgrades. I don't know of any dates, but I heard it wasn't for a long time if at all. So I guess we will all have to wait and see.
As for getting updates, I think you will like the manager. It makes it much easier. Frankly I didn't know the manager worked on the perpetual license. I knew it worked on the subscription. So it is good to know that it works for you as well.