Best info so far.
Hi Char 57, and welcome to Audioholics HT Forums.
There is no specific date of release yet for the Onkyo TX-NR907 (if this would be called that # model anyway, but I gess so).
But my best guess is late summer or early fall, or perhaps later in the fall of this year. The best info that I got so far, are mentioned in the thread called "* Everything to know about A/V Receivers but were afraid to ask *"
It certainly will have Dolby Digital Pro Logic IIz with the two Height channels.
But I'm not sure that it will also have two additional amplifiers for these speakers.
And I don't think that it will have the latest HDMI version 1.4a, which as for now is not necessary at all (and probably for still a few years).
Id I was you, soon that the 907 appears, I would purchase the 906 for a further discount (my guess is that the 906 will be approximatively $1,000 by then). Because it will be then discontinued.
And as for the remote Acoustic Research ARRX 18G, I don't have a single clue.
Just try Googling it.
Cheers,
Bob