Maybe, but I think Bioware's part of the EA presentation will be devoted to other things.
Mass Effect things
They may be doing stuff for mass effect at E3 but there would be no better time or place for them to promote their other IP’s as well, it just won’t be on the big stage with all the new releases/annoucements. If they were to show off anything DAI related it would probably be on the show floor or spoken about during dev talks.
I seem to remember that at E3 one year Bethesda was promoting their next big title, I think it may have been Skyrim, and at the same time were also promoting DLC for another game so there is certainly a precedent for developers doing this.