Aha! All it took was a web search to find
http://www.esa.int/esaHS/ESAAYI0VMOC_iss_0.html
Columbus module attached to the International Space Station
It looks like it will have standard racks just like the US lab and a coupleof little brackets outside that have attachment points for four exposed payloads. The description of what they can do is very general, and there's no discussion of experiments that are actually planned for Columbus. Someone in Europe might still be sorting out applicants who want to use the lab, or maybe they have stuff planned but it's a secret.
There's a really cool toy on
http://www.esa.int/esaHS/ESAI2X0VMOC_iss_0.html that shows where the space station is at this very moment, but it's just a small window on
http://www.n2yo.com/ which lets you play with lots of satellites.