LG has told The Inquirer that the Optimus 3D will be updated to Android 2.3 Gingerbread in October, at least in the UK. That's going to be ten months after Gingerbread was announced. It may also be very close to when Google will officially unveil the next version of Android, called Ice Cream Sandwich. Which means that Optimus 3D owners will only have a very short window of time in which their devices will be up to date, after which it's back to the waiting game. And who knows if LG will update the Optimus 3D to Ice Cream Sandwich? You're probably not going to find that out this year.
Oh, and the above is only valid for the UK. Other countries may get the Gingerbread update long after it starts rolling out in the UK.
So if you're into this whole 3D thing and also like your Android versions to be as up-to-date as possible, perhaps you should look at HTC's Evo 3D, since that will at least ship with Gingerbread preinstalled.
Apparently the Gingerbread software update for the Optimus 3D will do more than just get you the newest bits from Google though. LG is planning on making 2D to 3D conversion possible on the fly for applications and games, so you'll be able to play Angry Birds in 3D. The only requirement for that to work is that the app or game has to be based on OpenGL. Currently, the Optimus 3D offers 3D upscaling for pictures and videos, even having a depth control so you can customize the ‘amount' of the third dimension that you see.
Asked why it didn't launch the Optimus 3D with Gingerbread on board, LG basically said that it chose to ship. That tells us that work was started on the phone with Froyo, and then LG would have needed to port over Gingerbread. Which it decided not to do before launching the phone, in order to be the first on the market with a glasses-free 3D display.
source: Unwired View