32 channels of 24/96 uncompressed would be 74Mbps. With 18Gbps available, and 2160p video taking around 8Gbps, there's plenty of room for high rate, high bit depth audio. Since we don't NEED 32 channels of 24/96, and will likely never use more than 12 at 16/48, looks like they finally future-proofed the audio part of HDMI.
Just to add $.02 on the connector...it's terrible. No, a single user won't usually see a problem with it not locking, but installers do all the time. It's a mess. Horribly fragile too. 26ga HDMI cables are hose-like and can snap a connector off the circuit board in an AVR without any trouble, and pull connectors out easily. You home guys just don't see enough of it to know how bad it is, not to mention how touchy and difficult complex runs can be. Every other cable in custom install can be pulled, cut to length, and field terminated. Not HDMI! So, even for modest runs, if you want to be neat you're quickly into HDMI over CAT5. Can't wait to see what 2.0 Cat5 drivers cost.
HDMI 2.0 is following the same path that cell phones do when they upgrade. Add more features nobody needs, wants, or uses, and ignore the fact that the phone itself is terrible. HDMI 2.0 is doing the same thing. Sure, we need 2160p, and a few more channels of audio might be nice. And a more forward-thinking over-design is a nice change for the Consortium...out of character, thankfully. But they have not solved any of the big issues with HDMI: fragile, non-locking connectors, unreliable in long runs, HDCP and EDID stumbles, and your choice of unwieldy thick cables or thin fragile active ones.
I see no need to hold out for 2.0 to make a purchase unless you are planning for a huge 2160p display with 11.2 surround or greater. That's about 0.001% of us. And there's no content for any of that, and won't be for quite some time. And by the time there is, we'll all have to upgrade to HDMI 2.1a/b/c/d/whatever.
Holding off an investment to wait for future developments only reduces the time we have to enjoy it.
Sorry, not an HDMI fan yet. Now, if you want to talk Display Port....