INTC isn't done with Medfield, of course, you should expect more cores & and aggressive push on process nodes. I would consider it is a validation for their new mobile strategy: http://www.intc.com/releasedetail.cfm?ReleaseID=559064
And as to your point about ARM-based devices being more "innovative," to some extent all the ARM-based devices are basic shared-memory architecture with the same mix of IMG GPU's as Medfield. You could argue, conversely, that Intel is at least trying to innovate on their pipeline and memory architecture (an increase the L2 cache for example) which the ARM-based SOC's are not doing.
Of course I guess this just means you'll see ARM A15 designs coming to market sooner in an attempt to separate from Medfield?