Ok, I take back my specific wording, other sites may be much more like it.
But let's move to a different specific example: some of the R1 [CR2] rumors were way off, resulting in some people disappointed.
A well-known camera dealer even posted those incorrect specs on the product page, proving how much grip it's actually got, or it was originated from somewhere else, who can really follow all.
Outsider people simply have no vision whatsoever as to how these decisions come about, but there are more than likely several to choose from.
But: there is at least a small intent to lean towards exciting, rather than realistic and to be fair quite boring ("negative"), which is not what the community likes to be fed with and discuss.
I feel I can draw at least some sort of similarity between the Sony 24-70/2 (which of course is still being fed to search engines) being a 28-70/2
and the Canon 200-500/4 (or 5.6 with an extended, etc.) possibly being a 200-500/5.6
Canon at least does have a patent for a 24-70/2, so it's not impossible that they actually do one.
Or one can dream at least