Ok, so we are going to get a flood of new Tau related topics over the next few days I am sure, but my thoughts are these. (All information based on a translation of the spanish edition)
Are Tau going to be the go to AA army? It seems that many things can take Velocity Trackers to gain Skyfire. The Riptide (Cataclysm is the spanish version, which sounds so much cooler) can, Broadsides can and they are both able to take devastating weapons. Twinlinked S8 AP1 Heavy Rail Rifles with Skyfire. And if you can resist the lure of the Ion Accelerator Cannon, you will have 8 S6 shots which can be Novacharged (Overcharged using the Nova Reactor) to Heavy 12, S8, Rending.
Sounds like Tau are going to be focused on ruining everyone else's flyers and keeping the skies clear for their own.