In the late 1980s, McLaren-Honda team has been very successful, and Ayrton Senna and Alain Prost, its drivers, gave everyone a lot of memorable moments. It is quite natural that the current McLaren 2015 decided to recall the story.
The team posted a promo video regarding McVaren 2015 MP4-30, which contains direct allusion to the story and a hint of what might a new car looks like. The promo clip with a motto "A new era begins" shows a boy sitting in a room and painting the picture in a children's coloring book. At this time, there is a TV report from the Grand Prix Formula 1 of the 80-s of the last century, in which the winning team is McLaren.
At the bottom of the sketch in the coloring book, the boy paints the picture of a champion racing car McLaren-Honda in white and red, it can be seen a pattern of the bow of a modern F1 race car. This nose doesn't have the form of "an anteater nose", which 2014-sample race cars was famous for.
Thus, McLaren gives at once two hints: the possible colors of the team cars to 2015 and some form of vehicle that will match the new requirements of technical regulation.