This is just typical business restructuring within AMD it's not a fork in the business. The way forbes depicts it as a seperate entity. It's just a development team focused on engineering GPUs that report specifically to Dr. Sue [sic].
With respect, I wouldn't characterize this as "just" a business restructuring. I don't claim to have special insight of AMD's internal structures, but I've done a lot of talking to various AMD groups over the years and seen some of the inefficiencies this is meant to address.
After AMD bought ATI, it embarked on a specific mission to embed its GPU technology at every level of its CPU business. That didn't just mean baking GPUs into CPUs -- it divided the GPU teams responsible for developer relations, Catalyst, discrete GPU design, APU design, OEM partnerships, marketing, PR -- all of these various aspects of the GPU business were segmented and handled by different teams of people.
It was a laudable goal and an attempt to unify two different companies, but it didn't always pay great dividends in certain areas. Bringing everyone back together under a common banner and giving that assignment to Raja is, IMO, a very significant and important move.
No, it's not a magic bullet. It doesn't give AMD 20 points of market share. It doesn't give Raja $500M dollars to invest in GPU tech. But it should allow for much more efficient centralization of resources than AMD 's GPU divisions have had access to before, and give them a chance to create a more unified product vision.