Android Jelly Bean 4.2.2 update for Samsung Galaxy S III is now available, not from official source but unofficially. The firmware in question is a test firmware and you may get some ugly issues and problems.
Android Jelly bean development for Samsung Galaxy S3 is not over yet and Samsung will definitely bringing the official firmware sometime soon. But all those brave heart out there can download and try the firmware. There is also a video demo of what you are going to expect from this update.
Here are the complete list of features available
New enhancements in Android 4.2.2 update
Firmware Details

Samsung added 5 new colors to its flagship mobile device Galaxy S4. Samsung Galaxy S4 will be available now in Blue Arctic, Purple Mirage, Red Aurora, Brown Autumn, and Pink Twilight editions.
Samsung Galaxy S4 was released in Black and White color variants when lunched. Earlier we posted a leaked image of Samsung Galaxy S4 in Blue Arctic color.
Samsung Galaxy Note 3 is be not a mysterious device any more. Earlier we posted leaked photos of Galaxy Note 3, which is one of the most awaited gadget of 2013. After the success of Samsung Galaxy Note, Samsung followed the same trend with Samsung Galaxy Note 2 and this year Samsung will be releasing the successor of the smartphone series.
The latest leaked image comes from Chinese Twitter user, @punkpanda, and show the device to have a design much more akin to the Samsung Galaxy S4 and previous Samsung Galaxy Note 2.
Though there are various images of Samsung Galaxy Note 3 are leaked from various sources, there is no official word yet from Samsung about its existence.
The Samsung Galaxy Note 3 is tipped to feature a 5.99-inch display with full 1080p resolutions, powered by an eight-core Qualcomm Snapdragon processor.
Recently leaked Samsung Galaxy Note 3 photo samples suggest the large smartphone will have a 13-megapixel snapper in the rear with the same f/2.2 aperture lens and 31mm focal length as the Samsung Galaxy S4.

Samsung started pushing new firmware for Samsung Galaxy S4 Mini Duos (GT-I9192) to KIES server. For the moment the update is released for South America region but eventually everyone will get the update.
The Galaxy S4 Mini Duos is equipped with a 4.3-Inch qHD (960×540) Super AMOLED display, Dual-Core Qualcomm Snapdragon 400 CPU clocked at 1.7GHz, Adreno 305 GPU, 1.5GB of RAM and 8GB of internal storage. The device features a 8MP rear facing camera and a 1.9MP front facing camera. The Galaxy S4 Mini Duos comes in 2 colours, White Frost and Black Mist. The device runs Android 4.2.2 (Jelly Bean) with Samsung’s Nature UX 2.0 out of the box.
Firmware Details
Model: GT-I9192
Country: Trinidad and Tobago
Version: Android 4.2.2
Change list: 881413
Build date: Fri, 14 Jun 2013 09:55:01 +0000
Product Code: TTT
PDA: I9192UBUAMF7
CSC: I9192UUBAMF7
MODEM: I9192UBUAMF7

Mark Zuckerberg is in South Korea to convince Samsung making a “Facebook Phone” running Facebook Home application on Android. But it looks like Samsung clearly denied the request from Facebook CEO.
HTC is the only company which released a Facebook phone this year and the phone sale was dismal. As a standalone application on Android play store, Facebook Home has very bad user reviews as well. There are also reports that AT&T which is the only carrier selling HTC Facebook Phone will also stop selling the first Facebook powered phone soon. In these circumstances Samsung’s refusing make a Facebook Phone is understandable.