Give me a break! Adobe has information about this camera for about 6 months. They know it is a studio or architecture professional camera and people will teather into Lightroom.
This is not about to change a lot of code .....
Give me a break! 'Hey guys, Canon has this new camera called the 5DS let's invent some software for it'.
It also relies on Canon giving them the code, or Adobe having to reverse engineer it. And given the primacy of Adobe in the post-processing market don't you think that maybe it is in Canon's interest to get this studio capability out as soon as possible?
So unless you can prove when Canon released it, or what testing is needed to make sure it all works as expected, with as few bugs as possible, and with no conflicts to other software, then maybe it is not as easy as you make out.