Available now, Over the Air, through Ovi Suite and Nokia Software Update for the capacitive-screened Nokia X6 is firmware v21.0.004. A fairly major update, with upgrades to core apps, you're led through a backup-just-in-case cycle, though I didn't lose any data or apps. Of course, branded/locked handsets probably won't see v21 for a while - ask your network or vendor! Changelog and screens below.
Browser updated to 184.108.40.206
Shazam v2.5 added (30 day trial version)
Video Telephony upgraded
Mail for Exchange updated to v2.9.210
Stability improvements, optimisations and speed improvements
Comments welcome if you can add to this changelog!