It matters not what texts are used in the celebration of Mass on any day; only that one of those four possible combinations of Mass attendance be fulfilled.
the US bishops just received the note from Bishop Paprocki, clarifying that Monday December 9 is a holy day of obligation, on October 10. Rita Thiron from the Federation of Diocesan Liturgical Commissions just sent it out yesterday. [Oct 14] It is a holy day of obligation, we just had that discussion internally at the Archdiocese [...] yesterday over e-mail, and a draft notice of the change is in the works. Neither the Ordo nor any other resources reflect the change because we just received notice of it.
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