49. When they have arrived at the sanctuary, the Priest, the Deacon, and the ministers reverence the altar with a profound bow.
Moreover, as an expression of veneration, the Priest and Deacon then kiss the altar itself; the Priest, if appropriate, also incenses the cross and the altar.
50. When the Entrance Chant is concluded, the Priest stands at the chair and, together with the whole gathering, signs himself with the Sign of the Cross. Then by means of the Greeting he signifies the presence of the Lord to the assembled community. By this greeting and the people’s response, the mystery of the Church gathered together is made manifest.
After the greeting of the people, the Priest, or the Deacon, or a lay minister may very briefly introduce the faithful to the Mass of the day.
Nothing here is really controversial or disputed. Note the gesture to the altar is a bow, not a genuflection. Commentary on the Mass of the day is optional, and if used, should be “very brief.”
What is new from the 1975 GIRM? Just two things: the incensing of the cross at the entrance, and the directive for the priest to lead the greeting (and presumably the rest of the introductory rites) at the chair.