What's Up Michael Jackson's Sleeve?

The star who rocks back into the limelight with his 50-date U.K. tour this summer has more than a few surprises in his set to remind fans why he really is the King of Pop.

Some of the dancers in his show say e the 50-year-old seems more than capable of performing the intricate choreography which he made famous, and which helped make him famous, in the 1980s.

But the content of his British gigs may have some other surprises in store.

Looking back will be a big theme, sources with knowledge of his upcoming performances say, reminding people of his achievements and the people who have influenced him.

One of those people, the late Princess Diana, is set to feature prominently in photos and digital imagery as Jackson sings one of her favorite tunes, "I Just Can't Stop Loving You".

As he sings the ballad, the screens above will show old photos of Jackson with "The Peoples' Princess".

"He knows how well loved he is and how well loved Diana still is with the British public," one my concert source.

Other guests will also appear alongside Jackson, in the flesh - some of them likely among the now-famous younger musicians who were influenced by his music in their own careers.

The names of Justin Timberlake and even Eminem have been bandied about as possible guest stars, but some also say shamed R&B star Chris Brown is keen to show up and share the stage with his icon.

Brown, currently trying to repair his image after being charged with battering his girlfriend Rihanna, has said in the past that he "adores" Jackson, and that the pop star is partly the reason why he got into music.

Perhaps the King of Pop - no stranger to scandal himself - will now do young Brown a favor and try to give his career a boost.