With respect to I2S, I'll leave Mike to comment more if he'd like, but I believe it comes down to this:
1. We make (by and large) inexpensive products that are geared at the vast majority of applications, rather than specific, ultra-high-end implementations.
2. The opportunity in lower cost products is much, much greater than any high-price-tag stuff.
3. Because of this, it's more likely you'll see us working on connectivity such as WiFi or Bluetooth (yeah, I know, barf) before I2S, because this is more congruent with where we are in the market, and the engineering resources are much better used in this space. Note that this isn't a promise of future products; this is merely an example of other mass-market connectivity which we currently do not support.
4. Similarly, we won't be working on things like $2500 USB cables or reintroducing ST optical connections for our products, for the same reasons.
5. We don't ascribe any overarching advantage to I2S for connectivity, because every connector/format has its challenges in implementation--especially when working with a format that was never designed to run down a cable (I2S stands for Inter IC Sound).
6. If we're talking I2S via HDMI, HDMI has its own set of headaches (licensing, special test equipment, DRM, ongoing revision levels) that we'd prefer not to deal with. The best way to deal with HDMI is with a separate upgradable board, to ensure future compatibility.
All that said, sure, if I2S becomes a significant part of the connectivity mix, sure, we can add it in. Of course, that requires a bigger upgrade than our current modular upgrades, because it will affect the mix of connectors on the back of the product--which means a different inner chassis.