Last week I've received my copy of the new Ordo Cantus Officii. I first checked the 4 week cycle of Ferial Antiphons and the antiphons for Sunday Gospel canticles. It turned out that most of them have already been published:
The antiphons for the Sundays of Ordinary Time correspond exactly to those published in the Antiphonale Monasticum vol. 1 of 2005 (Surprisingly the new Antiphonale Monasticum isn't listed among the printed editions that they cite as sources, while the old Antiphonale Monasticum of 1934 and the Antiphonale Romanum of 1912 are.)
As for the Ferial Antiphons it turned out that the antiphons for Lauds, Hora Media and Vespers are the same as those given in Les Heures Grégoriennes with two minor exceptions: HG has the same antiphon "Dixit Dominus" for all occurrences of Ps 109, OCO MMXV has 4 different antiphons (which obviously are available from the new Antiphonale Romanum II), also HG has a Marian hymn, Responsorium Breve, and antiphon for the Benedictus for Lauds on all Saturdays. (The corresponding pieces of OCO MMXV are instead available from vol. 2 of the new Antiphonale Monasticum, surprisingly HG isn't listed among the printed sources either.)
So what remains to check is the antiphons for the Office of Reading. These are shown in part 2 of this post (the post had to be divided because of the length.)
Most of these antiphons may be found in the Cantus Database, others are contained in the Psalterium or the Antiphonale Romanum. Three more antiphons are from the Milanese tradition and may be found in Terence Bailey's edition (transscribed in the attached pdf). The sources of the remaining antiphons may be found in Frans Kok's monumental Laus Divina: two of these are similar to antiphons of the Nocturnale Vaticanum (also in the attached pdf), "Miserere mihi Domine" is from the Yrieix manuscript. The only Antiphon which is not readily available is "Faciem tuam" (according to LD from an Udine manuscript which I'm going to consult next time I come to the Stäblein Archive in Würzburg.)