Having been looking over the current 2014 regs posted on the FIA site.... the front wings will be narrower, and the chassis height lowered as well
3.4.1 Bodywork width between the front and the rear wheel centre lines must not exceed 1400mm.
Bodywork width ahead of the front wheel centre line must not exceed 1650mm.
Currently, width ahead of front wheel centreline is the same as the overall car width (1800mm). This will mean some interesting thoughts about which way to direct flow off of the front wing... inside or outside (as the moment) the front tyres
15.4.4 (end of..) - The maximum height of the survival cell between the lines A-A and B-B is 625mm above the reference plane.
No part of sections taken at the lines A-A and B-B may lie more than 525mm and 625mm respectively above the reference plane.
The minimum height of the survival cell between the lines B-B and C-C is 550mm.
The chassis height change is in there, with the rules now defining that the section at the front of the survival cell (A-A) can be a maximum of 550mm above ref plane. Previously, it was 625mm, and then they brought in the rule to lower the noses at 550mm, and thats what caused the stepped nose (with the bumps being allowed in the gap between the A-A section, and a point 1950mm ahead of the rear face of the cockpit entry template... rule 3.7.9).
Consequently, that has a knock on effect on the underside of the car, as the survival cell templates require a certain height below... effectively shutting off space under the chassis for airflow...
Add in the removal of the beam wing(haven't got that far through the regs yet :p ), and other changes... some pretty big aero questions to figure out, even if I don't think the cars will look radically different to this year...