Auro-3D is dead, IMO. The combination of slow moving on their part to secure BD disc manufacturing using it plus holding back on 13.1 (even 11-channel AVRs should have the OPTION to use rear surrounds instead of CH/TS as rear surrounds are vastly more common than otherwise non-existent CH/TS) and only TWO movies ever released in 13.1 killed it before it began. I love the music format with dual-quad mikes, but there's very little of that either and mostly jazz, orchestral and chamber music.... oh boy. There hasn't been a single major release on Blu-Ray the past year. Not one. I'd love to see them pull a hail mary, but I just don't see it happening when DTS:X can use the same layout and with DTS:X Pro will have 30.2 speakers to play with in any combination you want.
I've got 10 movies plus a demo disc in Auro-3D (wasn't easy getting that many, even; I had to buy them all from Europe and Australia) and other than Red Tails, there aren't any others that aren't also available in Atmos with more channels available. You're basically doing 5.1.4 with Auro 9 and two extra odd channels with 10 and 11. 13 adds rear surrounds, but then you either move surround height to the back or copy it. There's no support for separate middle and rear unless you create your own like I have with "scatmos" (Pro Logic extracting a channel in-between). Most if not all those movies use an Atmos master so small wonder they sound identical to Atmos in 5.1.4 playback.
Now the dual quad mike recordings are neat (very holographic), but there's no reason Atmos or X couldn't have recordings done that way, really. They just don't, unfortunately.