About a week ago I noticed the daily booster wheel on Candy Crush and was glad to get a few special pieces that I could save to get through tough levels. Today I spun the wheel and won the jackpot. It does not really say what the jackpot is but you basically get 3 of ever booster on the game. Getting these boosters helped get me through a few tough levels.
Make sure you spin the wheel each day. Good Luck!
screen shots from my iPad playing the daily booster wheel on Candy Crush