Title seems to imply that it's an official decision, and that's a bit disingenuous.
The normal release will continue with KDE4 and keep pushing it until it's stable. This is just for people "who are not quite ready to take the jump to KDE4.x."
It's still being brought back, however. KDE3 is not in the Hardy repositories _at all_, and adding it into your system without compiling everything by hand can seriously fuck your system over.