Hayden showing up. Imagine if they did a proper clone wars movie as a Star Wars story with Hayden and McGregor. Probably no chance but one can dream of a decent one with good writing and direction.
That might be the only reason he's there. Why else would he attend? It's weird. If if was this big 40th Anniversary you'd imagine Liam Neeson and Ewan McGregor also attending. Hell, McGregor could be the big suprise for an Obi-Wan movie announcement.
Surely it has to be greenlit sometime?