I have no worries about moving into IPv6 for a long time... As well, the host should handle that.
In other news, the Jose has been taking a look at SMF 2 and likes what he sees, though we may be waiting until it is considered stable (that is, not an RC anymore) before it's implemented. The choice ultimately will lie with the Glest Team. Glest Theme v3 will need a few more touches anyway, including turning on the drop down menus and a few CSS fixes for them.