Silly? Of course it is, McCann isn't even on the same team in charge of the graphical upgrade. Except that there has been a persistent rumor that the upgrade, revealed at Hero-Con along with the groundswell of Going Rogue information, will be going live before the expansion's launch anyway. Of course, McCann himself points out that he couldn't possibly follow up on his promise... which could mean that he knows something will happen. Or it could be the resident mad scientist of City of Heroes being his usual impish self. Either way, this rumor has a bit more meat on its bones, so players might want to go ahead and keep an eye on that thread.
[ Thanks to Informant D for the tip! ]