There are two ways to read the the tweet from Aaryn Flynn, General Manager of BioWare’s Edmonton & Montreal studios. The first is pessimistic, the tweet means nothing and does not confirm that that the original Mass Effect trilogy is coming to the new(ish) consoles.
The second, the optimistic option, is to note that Aaryn tweets that Bioware will give more news on the project “when” then have it, indicating that the PlayStation 4 and Xbox One extra shiny versions of the game are being worked on but they don’t want to talk about them yet.
Looking forward to #N7Day14! Unfortunately we have no news about the Mass Effect Trilogy coming to new consoles. When we do we'll share ASAP
— Aaryn Flynn (@AarynFlynn) November 6, 2014
You can make your own mind up, I’m going to guess that the trilogy will arrive, probably six months or so before a brand new Mass Effect, and they will be using Bioware’s next-gen engine to make the games extra shiny. That way they get to remind everyone about the brand and bring in new gamers to the universe before launching a whole new chapter.