As of 11.04 they will switch to LibreOffice. You can install it now via PPA.
If you use the regular repos then you will have to wait for Natty. There is
little difference except branding at this point.

www.ubuntugeek.com/libreoffice-gets-3-3-0-stable-version-released-ppa-ins\
tallation-instructions-included.html