During the next three weeks, the Church provides options for Mass, for those who are preparing for baptism at Easter. These are called "the scrutinies," and I know some don't care for them.
Here's how it works, in case you're unfamiliar--or maybe you've seen something other than this.
The readings are from "year A"--which was last year--so they aren't the same for this Mass as those used at all other Masses this weekend (same next weekend and the onee after). The Gospels are taken from John, and they are longer -- although an abbreviated lection can be used. This week, it was "the woman at the well"; next week, "the man born blind"; and then, "Lazarus raised from the dead." The Mass prayers are also different. Everything emphasizes preparation for the Easter sacraments.
In my homily I talked about the water having a double-symbolism of baptism and the Holy Spirit, and talked both about the thirst the catechumens have for the Holy Spirit, and the wonderful gift each of us has in our baptism. I also mentioned how much I look forward every year to giving this gift at the Vigil, and I invited everyone to take part.
After the homily, the catechumens and their sponsors are called forward; I invite them to kneel, we offer our prayers of the faithful, and then I pray a prayer over them called an "exorcism" (but I don't tell them that, since that might sound a little scary); it is about protection from evil, recognizing that the evil one would like to derail them. After that, I impose hands silently on them, and then dismiss them for reflection on the Word of God. The Creed follows, and then the rest of Mass.
I used the Roman Canon, in particular because there is an option for prayers to be inserted for the godparents, and those to be baptized.
The only other thing you might experience is two sets of intercessions--one for the catechumens, and then the regular ones; but I exercise the option of combining them.
I like this because it gives an opportunity to focus on the sacraments and also invite everyone to be aware of, and pray for, those entering the Church; it reminds us of our mission to share the Gospel. On the other hand, I don't like that the folks at that Mass didn't hear the other readings.