I have Google News rigged to email me daily with any news updates of the film, so, yes, I know most of the recent news.
And, unfortunately, Sean Connery said on the official website that he wouldn't be coming back for Indy IV, since "retirement is just too damned much fun".
I'm bummed out about this news, but I guess I can live with it. I'll deffinately miss Dr. Jones Sr. come Summer '08, but the first two movies were great without him, so I hope this next will be the same. (And I'm still hoping for a surprise cameo.)
But now, out of the four characters that were last seen riding into the sunset in The Last Crusade, only Indy himself will be coming back for the new sequel. Kind of strange, if you ask me.
Oh, and if anyone lives around the New Haven Conn. area, or anywhere in the surrounding states, I'd seriously advise you try to get cast as an extra in the upcoming call. My mother wanted to go (all the way from North Carolina), but she doesn't have enough time. Hopefully someone else will have better luck.
Edit: This isn't confirmed by anyone official yet (Then again, nothing has been confirmed by anyone from the studio itself!), but rumors are going around that Shia LaBeouf will be reprising whatever role he plays in the fourth film for three possible sequels. It's also been said that Harrison Ford has signed on for small cameo roles, but I only saw that on one site, so I doubt if it's real.
There are also rumors going around that Lucasfilm is considering an Indiana Jones animated series in the style of the animated Star Wars: Clone Wars series.
Again, these are just rumors, but I thought it worth mentioning.