The near-final Release Candidate of Firefox 4 for Android and Maemo is now available to download. The final release is expected in the next week or so.
Moving away from the beta builds, this RC is more of a stability and spit-polish release than anything else. Usability-wise, the release notes point out that there are now 150 add-ons that work with Firefox 4 for Mobile, up from 100 last month -- and there's now a Form Assistant, which should make logging into websites a lot easier, especially if you have Firefox Sync enabled.
Finally, the RC contains a link to Firefox Spark, a new badge-collecting website, which seems to be one of Firefox 4 for Android's 'launch goodies.' As far as we know, Firefox Spark will be a social game, where you share the Firefox for Android download link, collect badges, and level up. We're not sure of the exact details yet, though.
Grab Firefox 4 for Android from the Market or download the Maemo version.