I think the subject says it all.
For the first time ever, that I can recall, vCenter had an update release that has a unique API version ... 6.7.1.
Over all the updates of 5.1 to 6.5 ... doing an update 1/2/3 didn't change the API version from 6.5.1 to 6.5.2. And I've been using VMware since vCenter 2.5 ... so this is pretty new to me.
I guess I'm just curious to know why this was done?