With the Ubuntu 12.04 release date just around the corner and the release in final beta we should be expecting a release date any day now, the estimated release date for 12.04 Precise Pangolin is the 26th of April 2012.
Until then you might want to download Ubuntu 12.04 using our instructions, just so long you use apt-get update you will eventually be updated to the final stable release when it’s out. So if you are rolling out new servers now it would make sense to use the final beta and do a apt-get update apt-get dist-upgrade on the official Ubuntu 12.04 release date and then deploy your production servers.