Processor is the "A7", of course, but noone seems to know what it will include. An update to ARMv8 is likely, but that doesn't say too much - slightly improved threading instructions. encryption instructions and a bunch of the things that were optional in ARMv7 and which Apple is using anyway (NEON and VFPv4). Some are saying 64-bit, but there seems to be little reason for it at this stage. RAM standard increase to LP-DDR3 for higher memory bandwidth seems likely, and I think an update to a newer GPU is possible as well.