BOAC & Nick:
Nick's HUD picture reference does not have the AOA display. The PFD picture in the section dealing with Integrated Approach Nav (IAN) & NPS shows it clearly.
That would be repeated in the HUD in that configuration.
BOAC, you are correct, "most" is a relative term. The NG's I've dealt with have had AOA since 2001. I'm only familiar with specific carriers and all (not most) of their NG's have it.
(If you're an NG driver, you obviously don't have it. I apologize for exaggerating.)