Moviehole has the details:
The film, set to start shooting in South Africa on October 1, is on the lookout for an actor to fill the Rock’s shoes. As the sides say “There is no requirement to look exactly like a young Dwayne "The Rock" Johnson, but we still need an EXOTIC QUALITY: Polynesian, mixed race, Arabic, brunette. NOT blond. We also need our Mathayus to reflect the charisma and comedic elements of the character created by The Rock, especially in his warm, relaxed and humorous relationship with Layla, the young girl whom he has grown up with, and with whom he experiences a growing sexual tension.”
Wait, wasn't the Scorpion King already a prequel of "The Mummy"? So this is a sequel to a prequel to a half-way decent film.
Hollywood never ceases to surprise me when it comes to its lack of originality.