Update

[Amanda Drake]

Does anyone know when the software update 4.2 will appear on the Samsung S3

Posted via Android Central App

 

[meyerweb#CB]

No.

At least, nobody outside of Samsung and the carriers, and they're not talking.

 

[GTWalling]

This is what was reported on July 3rd.
Samsung Galaxy S3 and Galaxy Note 2 Official Android 4.2.2 Update Delayed Again Due to Galaxy S4 Sales & New Android 4.3 Jelly Bean - International Business Times