Believe it or not, James Cameron may not be King of the World by the end of the long Christmas weekend.

His 3D sensation 'Avatar' is not losing steam -- in fact, it set nonsummer weekday box office records Monday and Tuesday -- but early estimates from Wednesday show that 'Alvin and the Chipmunks: The Squeakuel' was out-performing the Na'Vis in ticket sales, $19 million to $16 million.

And when 'Sherlock Holmes,'Guy Ritchie's action-packed addition to the Holmes movie canon, opens wide Christmas Day, there may be three pictures running in a pack for the box office lead. Early reviews of 'Sherlock Holmes' have been mixed, but even the negative ones agree that Ritchie has concocted a brand new vibe for the Baker Street team of Holmes (Robert Downey Jr.) and Dr. Watson (Jude Law). And in a market where 'Avatar' is the dominant choice for adults and 'Alvin and the Chipmunks' the dominant choice for toddlers-in-tow families, 'Sherlock' is a sure thing for teenagers.