The only thing I found was a link on the latest Trim Tab for a Flight Ops Podcast recorded on 1/31. SD states that later that day he was presenting the flat screen upgrade to RA. He stated the M88/90 fleet has more life left in it then any other fleet at Delta. It appears there is a good chance that the M88/90s will be around well past 2020.

Also, the funding for the tablets was pulled for 2013 so we may not see them this year.