PureOS comes with Linux kernel 3.5.3, Gnome 3.4.2, Chromium 21.0 with Flash Player plugin pre-installed, Gnome Mplayer, Evince, Eye of Gnome and Gparted. If you want more things you will find them on the vast Debian testing repositories that include almost everything. Gnome fallback is also included.
Let me say a few things for those of you who never used a Debian testing based distribution before. Debian testing is the next step after sid and includes relatively latest software, and at the same time relatively stable. You won’t get the bleeding edge, but you won’t have a super-stable system, or a broken system either. You may encounter a few problems here and there but generally everything will work just fine.
Keep an eye on the forums before updating and check the Debian weather to see what packages work and what don’t, and everything should go smooth for as long as you like since all Debian testing based distributions can be considered rolling distributions.