Both the US and English Ordinariates have the Ember Days in the calendar.

My family observed Ember Days growing up, but it always felt like a personal, family, thing, not a church thing. I've never heard them mentioned in any church.

As for the responsibility of bishops, I'm confused. The article cites a 2004 NCCB document as saying that appointment of Ember Days is left to local bishops. However, in the 2010-approved US-adapted GIRM, we find two apparently relevant passages.

373. Masses for Various Needs and Occasions are used in certain situations either as occasion arises or at fixed times.

Days or periods of prayer for the fruits of the earth, prayer for human rights and equality, prayer for world justice and peace, and penitential observances outside Lent are to be observed in the Dioceses of the United States of America at times to be designated by the Diocesan Bishop.

(It goes on to specify one such day that is to be observed in all dioceses.) The 2004 document to which the article refers seems to be a precursor to this statement, and if nothing more were said on the matter, one would assume that Ember Days were included in #373, just not mentioned explicitly, and that it really is, still, just up to local bishops.

But then, later, we get this:

394. Each diocese should have its own Calendar and Proper of Masses. For its part, the Conference of Bishops should draw up a proper Calendar for the nation or, together with other Conferences, a Calendar for a wider territory, to be approved by the Apostolic See.[152]

...

In the drawing up of the Calendar of a nation, the Rogation Days and Ember Days should be indicated (cf. no. 373), as well as the forms and texts for their celebration,[154] and other special measures should also be kept in mind.

(The omitted part refers to the Lord's Day.) So the Conference draws up a "Calendar for the nation" and "In the drawing up of the Calendar of a nation" the Ember Days "should be indicated."

That sounds to me like the Conference itself is supposed to indicate the Ember Days, or, at the very least, ensure that they are indicated.

(I searched the USCCB web site high and low and found nothing indicating Ember Days. Did I miss it?)

Now that the Ordinariate Missal messed up the placement, I say use the older form and be done with it.

That makes me happy! (Our priests are both actually very good homilists. But to date, nothing on this matter.)

The Sacred Music Colloquium in 2011 included a Saturday Ember Day Mass at the Church of the Epiphany in Pittsburgh. Recordings are at
http://music.dierschow.com/2011Colloquium/#18Mass