They were supposed to get about EUR 3.5 M fix retainer, but would be able to earn a lot more from succes on track, making Webber get to as much as 6M and Vettel to 4.2M up to now.
I also saw german media reporting, that Michael Schumacher is getting over 30 million for his 3 years, so that would make a about 10 million/year. JA put Alonso up for about 16M per year from Ferrari, but additional money from Santander might have done the rest of the 30M.
Interesting how big the differences between drivers are (mind how much Lotus is paying their drivers! And how big the differences are between sums reported by different sources.