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From IMDb:

'Indiana Jones IV' Back On

George Lucas and Steven Spielberg have hired a new scriptwriter to help them revive plans for a fourth Indiana Jones movie. The pair hoped to begin work on the sequel this summer but have rejected all scripts offered to them - including a screenplay by Shawshank Redemption and Green Mile writer Frank Darabont. But they are refusing to give up the project they have planned for the last decade - and hired Jeff Nathanson to try his hand at a screenplay. Nathanson is most famous for writing the Rush Hour films, but has worked with Spielberg on Catch Me If You Can and The Terminal. If Lucas and Spielberg approve, Harrison Ford will return to play the adventurous archeologist for the first time since Indiana Jones And The Last Crusade in 1989.