thats something I'd like to see, in addition to just being able to bring up the upgrade dialog from a fleet of ships. Currently, you have to single out one ship from the design you want to upgrade and you can upgrade one or all. It would be nice to be able (for financial reasons) to upgrade ships in a fleet, so I can finance the upgrade on a monthly basis. Last big group I wanted to upgrade would have cost over 100,000 BCs.
The fleet upgrade is more of a nice to have, but I think that being able to get to the upgrade dialog from a fleet of ships is a far more important feature that I would like to see added sooner rather than later.