Just reading Wiki about the 747-8 I saw this:
The General Electric GEnx, which is one of the two powerplant choices currently offered for the 787, will be the only engine available for the 747-8. However, the 747 variant will be adapted to provide bleed-air for conventional aircraft systems and feature a smaller diameter to fit on the 747 wing. An exclusivity agreement between GE and Boeing, means no other manufacturers engine can be fitted the 747-8 within at least 10 years.
Is that a good marketing move, if true?
Duncan