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Searching through Ryanair's twitter account shows that they're constantly being asked this very question, but the only relevant information provided so far is on this section of their website:
€10 Travel credit reward for myRyanair sign-up
Any NEW customer signing up to myRyanair and completing a full profile between Sept 7th – 9th inclusive will be entitled to a €10 travel credit off their next Ryanair flight departing Oct 1st – Dec 18th and Jan 10th – Jan 31st. Flight bookings must be made between Sept 7th – Sept 21st.
It's likely that other reward programs would show up soon, but this is currently the only one.