JET is very reserved isn't he. I am operating from the rumors floating around in the paddock as well as what current and former drivers who have seen W03 have to say about W03's prowess. And the word is it's quick. Very quick. While it's not a WCC or WDC contender, it's certainly going to give Mclaren and occasionally Red Bull a difficult time every once in a while.
Ferrari are were W02 was this time last year. Trouble, and of the fundamental type meaning I bet we see a rethink on the rear of their sidepods sometime this year and possibly the front suspension.