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Most likely there will be two tiers for phones: landscape (480-768px) and portrait (0-480px).

I often end up adding that myself already one way or another, so I hope others are in the same boat and that is what they add!

Same here. I almost always end up with quite a bit of custom CSS for a 480px breakpoint between XS and SM.

Watches!

Kind of interesting, that would mean there will be 5 different sizes. I guess one between 768 and 480 or something?

Maybe because the iPhone 6 has a different width than an iPhone 4?