There you have 3 paragraphs of that article:
But even with this return to convention, the MP4-31 package isn't competitive. The reasons for this remain centred around two areas: the aerodynamics and the Honda power unit.
On the chassis side, there's evidence to suggest the car can put in fast lap times when not handicapped by the engine. This has been helped by the frequent chassis updates, as Prodromou brings the level of the aero detail ever closer to that of Mercedes, Red Bull and Ferrari.
The car already has all the right features, with no oddball parts or areas obviously lacking. With this in mind and with the present generation of car design at a mature stage, it's unlikely the next package - described as "significant" by the team - is going to be a radical visual change.