Welcome to Librarium Online!
A couple of quick questions
1) can they capture objectives
2) do they need to be in unit coherency with the devilfish or the tau warriors the devilfish transports?
The squadron counts for one kill point if destroyed.
The squadron is a unit in its own right and does not have to amintain coherency with the Devilfish or Fire Warrior unit.
The disembarked squadron follows all the rules for Gundrones in the codex.
do they get the special jet pack move?
Perhaps a bit late for this thread, but GW's own FAQ will confirm everything that Riki has said. You can find the FAQ here: http://www.games-workshop.com/MEDIA_...th_Edition.pdf
"Tau Commandment #226: Participants who use Velocity Trackers in the Tau Clay Pigeon Tournament will be disqualified"