I've upgraded two of my machine to Hardy and it wasn't completely without trouble. First off, I would recommend to the Ubuntu upgrade process team that if they can foresee an issue with your old/working wireless firmware drivers not working in Heron due to them upgrading to a new future version, than do us a favor and download the updated version.
Under 7.10 I had bcm43xx-fwcutter_006-3_i386.deb and wl_apsta-126.96.36.199.o
However 8.04 needs something like bcm43xx-fwcutter_011-3_i386.deb which means my upgraded machine is without wireless, atleast until I can do my further updates via LAN cable.
In other news, school is cool. All around challenging and intellectually stimulating. They like to drag you around for your first two years with yet-another-computer-class and some decent professors/grad_students, but once you get into the cool classes, ever class is cool (minus one), and all the professors are superstars (except one).
So the hope is that I shall become one with the code after this quarter, and be able to design my own computer architecture, do lots of software engineering projects, and make awesome happen out intense constraints... time, freedom...