If you'd somehow missed it, we are going from three-part to two-part version numbers. That is, the next release is 9.6.0, but the major release after that is 10.0. 10.1 will be the first patch release on version 10.
We can add 9.6 and 10 to the table now, with "TBA" for the dates, to make this more visually obvious. Maybe change the table caption from "EOL Dates" to "PostgreSQL Major Versions".
Then at least we have somewhere authoritative to point people if they are confused about the versioning scheme.