Google seem to be getting better and keeping everyone on the same page, but they should probably do more in-house testing for their operating system if they want to avoid future confusion like that situation. In addition, some experts have been suggesting that Google should release different versions of Android for their separate devices.
This is similar to the approach already taken by other manufacturers like Samsung, but it’s not clear how much Google can dedicate to a concept like that. For the big company that they are, they are also somewhat limited in their resources and they need to focus their work on the important parts.
Right now, polishing Android for its 6.0 release seems to be occupying the company’s time more than enough, and then Google will have to figure out which of their devices should get the new version of the operating system.
The new Nexus is basically guaranteed to ship with it out of the box, and the most recent devices released by Google are likely going to get a pretty quick treatment as well. But beyond that, the situation has been a bit unclear and people have been getting more and more anxious as September 29 approaches. Then, we’ll see what Google have been planning and what they’re hoping to achieve in the longer term with their new devices and new version of Android.