As most of you may know Apple released OS 4.3 early. The original launch date was to be March 11 2011.
If you have a jailbroken device or unlocked, as always, do not upgrade to the 4.3 OS or you will lose your Jailbreak and Unlock.
The Jailbreak teams are working diligently and anticipate a new Jailbreak for this OS very soon. Although no release date has been announced, the buzz seems to be leaning towards a quick resolution for this OS.
Be patient, as always, our hard working Jailbreak Teams such as the iPhone Dev Team and the Chronic Dev Team, or even George Hotz aka: GeoHot (If he has time outside of defending himself against the lawsuit from Playstation) we will have a jailbreak very soon!!