This is all just information that is being leaked from the beta, so take it with a pinch of salt, these features may not actually see release.
However in addition to the remapping option that has been doing the rounds of kotaku/reddit/twitter the past couple of days, the full proposed accessibility menu has now been shared by one of the people on the beta.
There are other features in there for low/no vision, presumably only affecting the main PS4 UI rather than games - zoom, text size, high contrast, and a screenreader.
https://twitter.com/isaparrot/status/574038584577015809
So if you have access to the PS4 beta program I'd strongly recommend you get on there and start sending feedback