I am running kernel 2.6.37-rc6 on my main OpenSuse 11.3 installation and it has quite a few advantages over the previous kernel release, offering a Open Source driver for the Broadcom WIFI adapters. This is quite a step ahead of the old system where you had to install the binary firmware into your system, especially with Ubuntu, Fedora Core 13 would include some more Firmware, but having to copy this into your system is annoying, having an Open Source driver included into the kernel is very important and allows a Linux distribution to support more hardware out of the box and not rely on a binary blob that can taint the kernel like the Nvidia driver does. Ubuntu 11.04 will include kernel 2.6.37 and the final release is slated to include 2.6.38, meaning it will have the best hardware support of any Linux.
Firefox 4 will be included as the default web browser replacing Firefox 3.6. As I have written here I am not a great fan of this version of Firefox and I would be wanting to keep a copy of Firefox 3.6 around to run on a more modern version of the Ubuntu operating system. Copying the MacOS look is not the best idea from Canonical, they should be able to come up with something better. Judging by the comments on this article, people are not sold on the whole Ubuntu changes at all.