I find myself thinking that 64 bit support will be Apples next support cuttoff point, probably not with iOS8 but maybe 9. Just like when OSX went 64 bit, 32 bit machines were supported for some time, then they decided everything had to be 64 bit and support was dropped. Now that GPU, it was listed only as "A7 GPU" in support docs (can't find the link now), while others were called SGX whatever GPUs. I wonder, is this their first in-house part? They were gobbling up GPU engineers. The driver number however seems consistent with SGX.