Packages for the release of Amarok 2.4 Beta 1 are available for Kubuntu 10.10 and Natty.
These packages are alongside KDE SC 4.6 Beta 1, so be prepared for lots of beta software if installing.
Bugs in packaging should be reported to kubuntu-ppa on Launchpad. Bugs in the software to KDE.
Users of 10.10 can install it from the Kubuntu Beta PPA.