According to Mike the cockpit will be a bit wider:
Quote:
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The ACO talked a lot about improving efficiency, and in regards to the chassis rules the primary move towards that appears to be the reduction in the maximum width from the traditional 2000 mm to 1900 mm (Art 3.1.4). This will result in a small frontal area reduction, something along the lines of 2-3%. But this will be coupled with an 30 mm increase in cockpit height (Art 3.3.1), as well as an increase in cockpit width given the new-for-2014 cockpit visibility templates.
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source:
http://www.mulsannescorner.com/newssept12.html