As we know MobileSyrup, the Canadian operator Telus will begin to release updates to Android 6.0 Marshmallow for Nexus and Nexus 5 6 already on October 5 that is six days after the presentation of Google. It is a typical practice of the company, when the latest version of the operating system appears to Nexus previously released a few days after the announcement of the successor device.
Note that Google continues to adhere to the two-year program of support for the newest versions of its operating system for smartphones. Thus, Nexus 4, is not likely to get Android Marshmallow, despite that went up in July, rumors that the search giant did issue the corresponding update for gadgets 2012 release.
Regarding the renovation of smartphones from other manufacturers to Android 6.0 is no information there. Most likely, the actual users of the flagships of the non-line of Nexus, will have to wait much longer. However, this practice is currently the norm and could directly from the search giant does not.