Few hours ago, after the announcement of iPad 2 and its specs, iPhone hacker p0sixninja of Chronic Dev Team posted on his Twitter that they'll focus on the jailbreak of the new iPad 2 on iOS 4.3 once they get it.
For those who don't know, SHAtter is an exploit found in October 2010. The team wanted to release it to jailbreak iOS 4.1 but Geohot came with Limera1n exploit and suggested to save the exploit for newer devices. So there's a big chance that it works on iPad 2. Let's wait and see!