iMore recently heard Apple's iPad 3 event would be happening on March 7, and now BGR is hearing that iOS 5.1 will follow on or around March 9. BGR also confirmed the new slide-up-to-access-camera lock-screen gesture spotted yesterday by Blog do iPhone.
iOS 5.1 has been in beta for quite a while and has been assumed to be coming with the iPad 3, so that timeline makes sense. Unless Boy Genius is holding something back, however, new camera access and Japanese support for Siri aren't a ton of new features for iPhone users to look forward to.
Previous iOS x.1 releases have varied in their new feature sets, gaining everything from the iTunes Store app in 1.1 to Genius Playlists in [iPhone OS 2.1] to Genius for Apps in iPhone OS 3.1 to HDR photography, Ping social music network, TV show rentals, and Game Center in iOS 4.1.
It will be interesting to see what, if any, surprises Apple has in store for iPad users with iOS 5.1, however, specifically designed to highlight iPad 3.