Here is the Oratio super Populum which may be used NOW (in Latin) after Holy Mass. Each day in Lent in the Ordinary Form now has this revived tradition according to the 2002MR which is, now, the edition of the Missal in force for the Ordinary Form.
PRAYER OVER THE PEOPLE:
Respice, Domine, propitius ad plebem tuam,
ut quod eius observantia profitetur extrinsecus,
I am pretty sure this is a reworking of at least part of an ancient prayer which is the Secret for Ember Saturday in Lent (tomorrow) in the 1962MR:
Praesentibus sacrificiis, quaesumus, Domine,
ieiunia nostra sanctifica:
ut, quod observantia nostra profitetur extrinsecus,
In the Ordinary Form we also have this "Prayer over the gifts", itself a reworking of a prayer in the 1962MR, and that in its own turn from the ancient Gelasian and Hadrianum and Paduense Sacramentaries.
SUPER OBLATA (2002MR):
Praesenti sacrificio, quaesumus, Domine,
observantiam nostram sanctifica,
ut, quod quadragesimalis exercitatio profitetur exterius,
interius operetur effectu.
Perhaps some of you can exercise your Latin powers with your own slavishly accurate versions, or smoother polished renderings, and the pick over the changes, asking yourselves: Is there a change of theology or merely of emphasis?