this is the first Android 4.2.1 firmware for Samsung Galaxy S3 I9300, a leaked version is now available


image source: ibtimes.com



firmware details:
pda: XXUFMB3
csc: OJKFMB3
date: 19 Feb 2013

some improvements and features:
- Android 4.2.1 JOP40D
- new Android 4.2.1 lockscreen with widgets
- Ripple effect on lockscreen improved
- Daydream


NOTE: this is a pre-release or beta, NOT a official release


download link:
I9300XXUFMB3 (by samsung-updates.com)