[quotemsg=21110197,0,146263]Pentium? You're kidding, right? If you are serious, know that Microsoft will most likely choose a low TDP/low wattage mobile processor for a small form factor Surface tablet. That means they will most likely choose the Intel Atom. Here's a full list of all the existing mobile CPUs:
[/quotemsg]As has been pointed out, the ULP Atoms are long dead. Cherry Trail-T was the last ULP Atom with a low-enough TDP for a smaller fanless tablet. Meanwhile some "Pentiums" are Core-based, and others are "Atom" by another name. So it's hard to tell what something is by product name unless you are very knowledgeable or take the time to look it up in Ark (and you still have to know what you're looking at).
The bottom line is that regardless of whether this is a "Pentium" or "Core M", it's guaranteed to be a low-power Core-based chip, like the existing Y series chips.