Hamilton: Mission: 5th place or better.
Tactics: Avoid accidents, avoid a slow start, by running lower fuel, which provides a better start, and from the front row, faster acceleration, later braking, and less chance of hitting a car on the first lap. If leads first lap, open a gap, come in early (due to fuel), come out in the middle of the pack, recover and come 4th.

Kova: Mission: Mess up Massa, get points, defend Hamilton
Tactics: Start light, defend Hamilton, mess up Massa.

Massa: Mission: Win race.
Tactics: Avoids accidents, use ultimate best strategy, normal fuel.

Kimi: Mission: Mess up Hamilton, benefit Massa.
Tactics: Start light, get through first corner first, if Hamilton is in the way, too bad for Hamilton (who'd be silly to mess with Kimi at the first corner).

The start features a significant up will climb, therefore a light car will have a much more significant advantage. IMO it makes sense for only Massa to start with a "normal" fuel load.

I think its questionable to have Hamilton in the midst of the action on the first lap - he is not naturally a defensive driver, and driving to be defensive for him is un-natural. Its easier to start him light, and get him out of trouble.

Therefor Kimi must do the same thing. And with Ferrari's lead in the team championship, having Kimi slip back a bit won't harm their chances much at all. Plus if he bothers Hamilton, Hamilton might loose his cool or make a mistake, or even be hit by Kimi.

If there is an SC, I don't know how common they are at the Brazilian GP, and whether they happen more often on the first lap. Would running light be damaged by an early SC?

Hamilton = super-light on fuel, pole position, scampers off for a few laps, falls back down a couple of positions as a result but nails the WDC.

Massa = speak to Max, Glock, Alonso & Raikkonen and offer his first born in exchange for a well targetted swipe at Hams sidepod and silence from the stewards.

Or both could pray for rain.

Sutil: Mission: Cause safety car after Massa's pitstop
Tactics: Take Nelson Piquet Jr on a 'guy date' and proceed to intoxicate him with home-brewed veritaserum potion. Use said potion to find the secret key to Hogwarts.
Oh, and learn how to cause questionable incidents without risk of a penalty.

Kovalainen: Mission: Bring glory back to Vodafone McLaren Mercedes
Tactics: Have a damage-inducing vehicular collision into Felipe Massa and drive a brilliant display of competitive fortitude however let Hamilton pass before the finish.

Massa = Switch the 'Drinks Bottles' button label with the 'Speed Limiter' button's label on Hamilton's steering wheel .

I think here we have the winner!