A Dell mobility GPU configuration page has exposed a couple of interesting choices - an NVIDIA GeForce GTX 675M based on Fermi (580M rebadge) and a new 1280SP Radeon 7970M, apparently based on the Pitcairn found in the desktop AMD Radeon HD 7870.

Until now the only AMD Radeon HD 7000M series products available have been rebadges of the last generation 6000 series.
The Dell page indicates the cards support CrossfireX, but nothing about Dual Graphics for use with upcoming AMD APU's based on the Trinity design.

Until now the only AMD Radeon HD 7000M series products available have been rebadges of the last generation 6000 series.
The Dell page indicates the cards support CrossfireX, but nothing about Dual Graphics for use with upcoming AMD APU's based on the Trinity design.