Fewer cars, teams and drivers will start this year's championship, one of the sport's stars is mysteriously missing amid a spiral of conspiracy theories, and, as financial constraints continue to eat into its balance sheets, the global juggernaut that mixes glamour, danger and speed faces an uncertain future.
At 84, the sport's enduring commercial ringmaster Bernie Ecclestone is also under scrutiny.
After the tumultuous events in 2014 when Briton Lewis Hamilton seized his second drivers world championship from the clutches of Mercedes team-mate and season-long rival Nico Rosberg in a brutal finale in Abu Dhabi, a similar on-track sporting scenario is in prospect.
Off-circuit, however, it is a different matter.
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The grid has been reduced following the demise of the Caterham team and only 20 cars are expected to line up for the opening race, or 18 if the Manor-Marrusia outfit, a re-hashed team built from the remnants of last year's Marussia, fails to qualify.
- talent and race-craft -
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His survival battle overshadowed the final races in which Hamilton stole away from Rosberg with a demonstration of talent and race-craft that has installed him as favourite to land a third title.
At 30, and single again if the latest reports of his on-off-on-off relationship with singer Nicole Scherzinger run true, he may have the maturity and motivation to dominate.
Spaniard Alonso won two titles with Renault before his unrewarded toil with the scarlet scuderia while Vettel, four times a champion at Red Bull, was out-performed last year by Australian Daniel Ricciardo.