I’m on the beta-release channel for both my desktop and mobile Firefox and my desktop has been running version 11 (with SPDY) for over a week now, but there hasn’t been an update for Firefox Mobile Beta in the Android Market yet. Apparently the Mozillians are working hard to finish the complete overhaul of the front-end, which integrates with Android UI (instead of using Mozilla’s own XUL) and services (synchronization in particular).
As I’m an impatient guy, I installed the Aurora version of Firefox Mobile, which is already at version 12 and that runs surprisingly well. Firefox Mobile already had the best HTML5-support and superior JavaScript-performance, but the new version (be it 11 or 12) adds a lower memory footprint and (much) faster start-up-time to that (and it has Flash, which I don’t care for really).
Mozilla is doing a great job in the mobile space, with the browser, but also with WebAPI and B2G. No, I don’t think I’ll switch to Chrome Mobile any time soon.