Besides the limited bracketing, there are other things that make this rumor a litte unbelievable.
If they put in a SD, they probably would go for SDXC rather tah just SDHC. Especially if itcomes with a USB3 interface, which still is not all that common, especially in the Apple world.
120fps @ FullHD is about 1GB/min in data, would be a little much for a main photo tool, imo, though ot impossible.
At least the rumour points to the ISO race being finished. The ISO 12/25 would be welcome.