Besides the more server oriented features which i've mentioned earlier there are a few desktop enhancement also coming with the next update of Solaris 10.
Both Firefox and Thunderbird will be updated to the latest, or close to latest releases. Firefox will be of the 3.5.x branch and Thunderbird of the 3.0.x branch. The bundled StarOffice 8 is replaced with an OpenOffice launcher that if not installed explains this and points the user in the OpenOffice direction.
LSARC/2009/446 Firefox 3.5.x on S10
LSARC/2009/085 Thunderbird 3.0.x
LSARC/2010/070 Thunderbird 3.0.1 on S10
LSARC/2010/017 EOF Bundled StarOffice 8
LSARC/2010/018 Mechanism for facilitating the installation of OpenOffice.org on Solaris
Talks I have given
5 months ago