It has pull rod front suspension and uses the modesty panel!
There is no modesty panel. I don't know why people are assuming that the car has one simply because there is no step in the nose.
The 2012 regulations were intended to be a stop-gap between 2012 and 2014, when the regulations will mandate a lower nose and monocoque (the space between the front axle and the cockpit) design. However, because a higher monocoque has more aerodynamic advantage, the teams went for the quickest, easiest and most efficient solution: a step in the nose.
However, McLaren did not. For the past decade, their cars have all had lower noses and monocoques (except the MP4-25, which had a higher nose than its prdecessors, but a nose that was slightly lower than everyone else's). So when the MP4-27 was launched, it didn't have a step nose, because McLaren was already working towards the 2014 regulations, and had been for years before those regualtions were even written.
The MP4-28 has no modesty plate because it doesn't have a stepped nose. It's a continuation of the MP4-27, which never had a stepped nose, and so it makes
zero sense for McLaren to have abandoned a design philosophy that has served them well for a decade, build a car that will only be good for one season, and then go back to taht design philosophy in 2014.