It's been awhile since Tau have been on the rumor front. Finally there is a little information coming out that will see a codex update soon with a new Fire Warrior box set to build two units from, and a new Riptide sized suit.........
Please remember that these are rumors.
via Lords of War Gaming
Here are some parting truths about Tau:
They will have a new Fire Warrior box. Two types of units can be made.
New Crisis Suits
More commander suits
New Riptide sized Suit that has large missiles
Looks like a Tau Aegis Defense line with circular weapon platforms.
Don't know about the rules, so don't ask.