iOS 6 has just been released!
A few minutes ago, Apple publicly released iOS 6, so you can now go ahead and update.
This update can be done over the air (via wifi) or by plugging your iPhone / iPad / iPod Touch 4th Gen into iTunes.
You need 2.5Gb free on your iPhone in order to do the update, so I’ve got to do a little spring cleaning before I can update.
The actual download is 626Mb, so make sure you have enough data available.