In the opinion of many, myself included, Ecclesia Dei has become outdated and is a dead letter. First and foremost, bishops do not grant generous use of the Tridentine Mass, as was requested. Secondly, the canonical debates over the Society of Saint Pius X (SSPX) have developed beyond Ecclesia Dei's brief treatment. I think Pope Benedict recognizes this. Thus, I am eagerly awaiting his treatment of the Tridentine Use.
My hope is for Personal Apostolic Administrations to be erected. Thus, the Tridentine Use will be given a seperate governing body, and will no longer depend upon the good will of Novus Ordo bishops. I also hope a quick reconciliation can be effected with the SSPX. To do this, Pope Benedict will have to admit that every Roman priest has a right to the Tridentine Use, as was confirmed by the Nine Cardinal Commission of 1986.
Whether or not these hopes are fulled, the Tridentine Use will be given wider recognition and a more stable canonical status. But as TheistGal above points out, the Novus Ordo will remain the primary use of the Roman Church, though it will be given a more traditional impetus.