I believe that the possibility of using on Type 45 and 26 was also mooted, so we are probably talking either small aircraft in the ScanEagle class, or possibly rotary. I very much doubt anything meaty is being contemplated just yet.
However, I think it is right that we should be trialling the concept. Any early capability would likely be limited, but there is a lot of development work going on on UAV's of all sorts, so who knows what capabilities might become available during the service life of the new ships?
LF