I had a note from a reader with a list questions. It is a brief list, without any rambling, so I won’t ramble either.
First, UE 28 is the (soon-to-be infamous) paragraph with the derogation of liturgical practices that came into use after 1962 which conflict with the rubrics of the books in use in 1962. That means that, if there is a conflict, the 1962 rubrics and practices are to be followed, not the more modern practices.
So,.. to the questions.
1. May communion be distributed under both species? [I don't think so. This was permitted after 1962.]
2. May extraordinary ministers of holy communion be used? [No.]
3. May one receive communion standing, or must one kneel? How about communion in the hand? [Standing, yes, if you cannot kneel. In the hand, no. That was a modern indult. However, the may be the issue of force of custom. I suspect this will be clarified. This gets into the messy question of "rights". I don't think people have the "right" to receive in the hand now, but there is a privilege that must be respected, for the Ordinary Form. Extraordinary? I don't think so.]
4. May lay persons (esp. lay women) proclaim the scriptures? [No. But there may be, I think, a commentator, but outside the sanctuary. The "straw subdeacon" singing the Epistle is at issue here also. So, there was a situation in which a layperson proclaimed Scripture in 1962.]
5. May girls also assist at the altar? (I note that the Vatican spokesperson simply sidestepped that question by saying that this document does not address the issue). [No. That came by law after 1983 and is in conflict with the 1962 books. The 1962 rubrics is undoubtedly male. The utriusque sexus" came much later.]
6. Since “permanent” deacons did not exist in 1962, do they have any role in the EF? [Permanent deacons are deacons. Of course they have a role: deacon.]
7. Which eucharistic fast ought to be observed? [I don't believe there is a rubric for the faithful in the 1962 books. There is for priests celebrating more than once a day. The fast is covered in the Code of Canon Law.]
8. Is concelebration allowed? [Only at ordinations to the priesthood, as described in the rubrics. Otherwise, NO!]
9. What liturgical items must be used? [?!? Those described in the books. But, can you not use certain vestments? If the altar is not consecrated, must you have a Greek corporal? Rubrics say you kiss the relics. So... we'll see.]
10. For the triduum, must the Good Friday intercessions (especially the intercession for the Jewish people) be used? [Of course they must be. They are in the book. Say the Black - Do The Red.]
I would add that par. 28 also would imply that priests may not opt out of using prescribed vestments. It would also have implications for what music can be used or substituted.