He's having a great time while doing it too.
Being part of the Star Wars: Episode VII press tour clearly did a number on Harrison Ford as his secret keeping skills are through the roof. Seriously, we wouldn't want to play poker against him after seeing him give nothing away to Jimmy Kimmel about any possible future appearances of Ford in the Star Wars saga, which he seems delighted about.
But then, it's probably all that Disney money that's got him smiling so much.
As for Indiana Jones info, Ford was also tight-lipped. Probably because of those sweet, sweet Disney dollars.