Andretti also speaks of the need to safeguard the US GP in Austin, Texas amid growing concerns about the future of the race.
Ocon to replace the F1-bound Pascal Wehrlein at Mercedes' DTM team for 2016.
Armand steps up from Formula Renault 3.5 to join Trident in GP2.
Marchionne believes that more manufacturers entering F1 is key to safeguarding the future of the series.
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