kikloo :
Damn I just ordered the bloody dual gpu thing.

Need to cancel it ASAP.
If you can, I think you should.
Not that the 8650G + 8570M solution is bad, but I don't think it makes sense if the GT 720M is similarly priced.
In fact, even the much more powerful HD 8650G + HD 8670M array just ties with the GT 720M at usable resolutions in many titles. In others, it manages to win. But it won't matter having 15%, 20% more FPS when you're suffering from micro stuttering.
Also, the GT 720M solution gives you noticeable improvement in CPU performance of 15% ~ 20% in most scenarios, as the AMD A10-5750M is comparable only to a sandy bridge Core i3-2330M, and going for the GT 720M laptop gives you a Core i5-3230M.
Last but not least, Ivy Bridge tends to be more power efficient than Richland and with the GT 720M set to use Optimus, you should see lower power consumption in daily usage with it. Assuming that the OEMs used the similar batteries, screens and such in both GT 720M and A10 machines, this should result better battery life.