Kamui Kobayashi, Bruno Senna, Jaime Alguersuari, Lucas di Grassi, Nelson Piquet Jnr, Luciano Burti, Antonio Pizzonia, Sebastien Buemi, Enrique Bernoldi and Ricardo Zonta have joined the list but Maldonado seems to have dropped off it.
That still leaves 13 F1 drivers past and present on the grid, and that could be bumped up to 14 as Jules Bianchi is racing too.
Also on the grid are Auguto Farfus (WTCC), Felipe Nasr (GP2), Pietro Fittipaldi (grandson of Emerson) and Joao Paulo de Oliveira (Super GT/Formula Nippon) among others.