I don't think so. I've been trying to determine what it's for since the 13" teardown, and as I haven't found any references to Haswell's iGPU being able to use its own discrete memory (rather than main memory or the shared L4 like cache on the 5200), I'm thinking it has something to do with the Broadcom BCM15700A2.
Of course we then have a mystery as to what the Broadcom BCM15700A2 is for. As the only references to it I have found have been on these teardowns.
What is the Hynix H5TC4G63AFR 4 Gb synchronous DRAM for? That's 512MiB that's not part of main memory, and I don't see a chip that's analogous to it on earlier models.
Can Haswell's iGPU use RAM that's dedicated to it rather than share the main system RAM?
The pin-out for a SIM and micro SIM are the same. You could cut down a full size SIM to fit and it would work.
Yup pin-out, clock-speed, etc., are the same; I don't think there's been a SIM whose chip was larger than the contact area for over a decade, so be gentle with a sander, sand the @*%^*^! down, and voila.