Microsoft quietly updates the Surface Pro 2 with slightly improved CPU

Did you buy a Surface Pro 2 or plan to buy one? If you’re planning on buying one you might want to wait a bit until current retail stock is replenished with the Surface Pro 2.5. That’s right, Microsoft has silently refreshed the CPU inside the Surface Pro 2 that launched two months ago with an ever so slightly improved one.
Full story from the WPCentral blog...
Re: Microsoft quietly updates the Surface Pro 2 with slightly improved CPU
It only seems to be a speed increase and a few added features however wonder why they would change the CPU.
I would guess a supply issues.