Nexus 4 didn't get marshmallow did it?
And you know this because....?Neither will be getting Android N.
OK, but as I recall the Nexus 7 (2013) didn't get the M beta.Are they eligible devices for the beta program? Nope. The N4 is EOL and the N5 will continue to get security updates after MM. Just like N is the last version of Android the N6 will see, but will continue to get security updates for one year after N. Google announced this last year.
Yeah I know they said that, and the n5 probably won't get n.Google stated on numerous occasions that 2 years after device release is end of the road considering updates (security updates should go more).