#1 - Slim and none, and slim just left the building. DL flyers cannot get First class on an AF award tix. You can pony up the difference between Bus and First and get a seat that way. Approx. 5000.00 more each way. Having flown both classes on AF, NOT worth the difference in price.
#2 - Yes, there are class bonuses on paid business class. Bonus level depends on fare class, and status with DL. The DL site can give you the exact bonus level.