Let's have a look at the current nose of the Mercedes car. The tip is located approximately 800mm ahead of the front wheel center line and is around 300mm wide at the tip and also behind. Both these dimensions are not legal for 2015!
Article 15.4.3 (of the 2015 regs) says about the nose crash structure:
"...its forward-most point must not be less than
850mm forward of the front wheel centre line..."
"A single external vertical cross-section, perpendicular to the car centre line, of more than 9000mm² at
a point 50mm behind its forward-most point. No part of this cross-section may lie less than 135mm above the reference plane and its overall
width must not exceed 140mm."
"A single external vertical cross-section, perpendicular to the car centre line, of more than 20000mm² at
a point 150mm behind its forward-most point. The overall width of this cross-section must
not exceed 330mm.
When measuring these sections, only parts between the highest point of the section and 100mm vertically below this point, may be considered."
Here are some basic shapes for the two cross sections mentioned above, that should be possible within these new regulations. Article 3.7.9 further limits the height of the first cross section to 85mm (=220mm-135mm).
Dear FIA, if you read this, please pm me for a redesign of the Technical Regulations to avoid finger nose shapes for 2016! :-)