I'll be surprised and disappointed if it doesn't have Skylake inside which would be another reason to reduce inventory of the Haswells. I might be the exception but I'm usually surprised at what they left out not what they included but I regularly scour for new stuff. They did surprise me with micro USB charging on S3 wasn't expecting that one... nor was I expecting S3 but was also surprised at the apparent segment void until it showed up.
The SP4 being much anticipated... surprises will be a little harder... especially if they hold 100% to the accessory compatibility commitment but to me that doesn't rule out the possibility of other options in addition to a compatible one.
I'm half expecting a new S3 model also, not based on any leaked or inside information, to me it just makes good sense but that doesn't mean they will do it. I like good choices, there are lots of people with different preferences, I say embrace that and let them choose.
I assume Apple will prbly go quad core with their SoC this year and iOS Nine is said to up the multitasking capabilities and probably enterprise supportability, though it's likely to be lipstick on a pigish. The A9X will have performance advantage over Atom Z8700 but not Core series but they will market the holy crap out of it so competition will be heating up for enterprise customers.