After Paris we are certain (since Shanghai final actually) that the rankings will be : 1. Djokovic 2. Federer.
There's still a small uncertainty on the 3rd rank : if Nadal comes back and wins Paris at once (and Murray is not in the final), he would be number 3 ahead of Murray before the WTF !
More seriously, if Tsonga wins Stockholm final tomorrow, and if Nadal doesn't play Paris (99%) and Federer doesn't play Paris (he said yesterday that he's not sure to play there : will decide after Basel, I think he'll not come to Paris if he goes far in Basel), Tsonga will take the number 4 seed in Paris from Berdych.
Stepanek will not a get a zeropointer anyway as he qualified in Basel.
I would guess Istomin will also get a zeropointer as I don't know the reason for his withdrawal from Basel but when he announced it, he was still in in Moscow and didn't look injured. And he's still in in Paris.
Does anybody know the reason why he's pulled out from Basel ?