Jens Bergensten, one of the development team at Mojang, has just announced that the Minecraft 1.4.3 Pre-release has just been released.
The news was revealed on Twitter and the Mojang website by Jens; in the announcement of its release Jens also revealed that it included over 100 separate bug fixes. These fixes include tweaks to stop random fall damage as a result of lag and altering collision boxes on Slimes.
To get the 1.4.3 pre-release head over to the Mojang website.