The official website for Indiana Jones IV has confirmed that Cate Blanchett and Ray Winstone are in the new movie, as is John Hurt, whose name I have not seen on these lists before — but not Sean Connery, who has issued a statement making his non-involvement official (“retirement is just too damned much fun”, etc.).
Connery does wish cast and crew all the best, though, and he gives “Junior” some advice, including: “Demand that the critters be digital”. Reading this, I am once again reminded that it has been 18 years since the previous Indiana Jones film, and I don’t think any creatures were digital back in 1989, let alone before that.
There is no official word yet on who any of the actors are playing.