Not a T'au player, but curious: what's the flyer in the top right corner of the picture in today's article?
It doesn't look like anything in the GW or Forgeworld stores. Could be just the angle and the paint job combined with my lack of familiarity with the range, but it didn't look like anything I've seen elsewhere.
It's just a sunshark Bomber, the other option for building their flyer kit of the razorshark. Understandable you wouldn't recognise it, not a common model.
I want to drag attention from the Blastcannon and talk other details. Counterfire Defence System (CDS) is now a stratagem which is interesting AND...well this is warcom but we'll have to see but they mention improvements to Toughness, Wounds, Save AND built in shield generator.
Not got stats in my head off the top but if I remember right: T7, W20, Sv3+ and no inherent Invulnerable.
Improvement would only be T8, W24 (my guess, in line with a knight), Sv2+ and 4++. However that is going with how current Shield generators are now but I wouldn't be surprised if generators went to being 5++ with +1 to your armour saving throw.
As for the Piranha, that's interesting. To be fair though, they were already a good unit but now they get better.