The official FAQ has been revised - you can grab it from here
The big news is that Tau Pathfinder Kill Teams are now composed of 3-10 Pathfinders and an additional 3 Drones. Recon Drones have been bumped up to W2.
They have explicitly confirmed that the ion rifle shouldn't have an overcharged profile, Drones cannot advance (ignoring What Doesn't Kill You... results too) and Drone wargear functions whilst the bearer is down.
There's also confirmation that new recruits make up half by model count, so the 10+3 team means Tau can bring an extra 2 Cadets now. Leader, 2 specialists, 3 Drones, 7 Cadets is a valid penny-pinching team Edit
: Just spotted this was covered deep in another thread - apologies!