"OK, let's cut to the chase, and tell you what's new in Ubuntu
9.04 Alpha 3. Finally... the OpenOffice.org 2.4 packages were
replaced with the OpenOffice.org 3.0 ones. Actually, the installed
version in Alpha 3 is 3.0.1 RC1 (see screenshots 2 and 3 on the
fifth row). In other "good" news, the EXT4 filesystem was
implemented in the Ubiquity installer, but it will not be the
default filesystem for Ubuntu 9.04, and it's only available if you
choose manual partitioning when installing Ubuntu. Using EXT4 as
the default filesystem for an Ubuntu installation will reduce the
boot times with 20% or even 30% on some systems."