How about tanks getting cover saves, and markerlights removing cover saves? I think this will be a pretty big advantage. Tau will also be the premier anti-tank army with Necrons taking the -2 glancing penalty.
Along the same line of think that JMarv pointed out. Think about equipping all your tanks with gun drones now. The drones can go out and block assualts and any unit is going to blow through a 2 man drone team. Your opponent gets no KP or VP for them so I see it becoming a huge Tau tactic, might replace kroot.
Besides the new area LOS rules effecting Crisis JSJ, and that can be fixed with new terrain building, where do Tau actually get hurt? The biggest problem before was units leapfrogging threw your army and that got nerfed. They can't even clip units anymore because everyone has counter attack so even a FW squad is going to be dead or break everytime now, the -1 for each wound you lose combat by and the Ld 8 isnt going to hold.
I really see Tau becoming a top list. They are one of the few armies that have multiple S5 shots in units to handle hordes. You might want Stealth Suites instead of Crisis for the same reasons Marc already pointed out.