Wikimedia Bugzilla is closed!

Component: Page editing -> UI

If I'm not mistaken, this is already working. We can already add the summary attribute to table:

{| summary="Intersections are listed in row 1. 
Find the intersection closest to your starting point 
or destination, then read down that column to find 
out what time the bus leaves that intersection.  
Service begins at 4:00 AM and ends at midnight.">
|+ Schedule for Route 7 going downtown
! scope="col" | State & First
! scope="col" | State & Sixth
! scope="col" | State & Fifteenth
! scope="col" | Fifteenth & Morrison

etc.
|}

So says the accessibility guidelines for editors I wrote at http://en.wikipedia.org/wiki/Wikipedia:Manual_of_Style_%28accessibility%29/Data_tables_tutorial#Providing_a_summary

Has been working since at least late 2010 it seems. Confirmed to today by myself as well.