you forgot about motomagx. it was also used on the z6w (which i own).
motorola promised they would release the sdk for developers, and the last time i checked, that never happened.
i wouldn't be surprised if they do in fact pull the plug on android, but then again, motorola has a habit of making bad business decisions.
Motorola is very unlikely to ditch Android. Android fixed the one thing other mobile Linux OS can never have, which is having plenty of apps.
If Motorola is doing an HTML5 webOS, its likely not related to smartphones but tablets. Honeycomb pushed itself into a corner into a full power OS requiring a dual core CPU. In other words, expensive.
Honeycomb makes me rethink the validity of ChromeOS - a simple cloud based OS using HTML5 as its application framework. Maybe Motorola should just head straight to ChromeOS at all.