Still no launch date for Cloud 9. There were a bunch of planning applications for new masts in the past couple of weeks, don't know if that is for them or for the new Cable and Wireless network, if it's for Cloud 9 it means they are a couple of months from launch yet.
But I've found their roaming list (from their parent, Wire9):
http://www.wire9.com/default.asp?section=15&id=39
Very weird geography in there (treats most island groups separately - even the Hebrides!). Some suprising omissions, such as Movistar Mexico and 02 Ireland (and no BVI), but quite a long list.