This is per a print ad on page 7 of the new (March 2012)
InsideFlyer magazine.
Register now at ChoiceHotels.com to earn unlimited free nights during the promotion.
Book a ChoiceHotels.com or 800.4CHOICE and after your second stay with arrival between March 8 and May 8, 2012, you'll receive enough Choice Privileges points to redeem for a FREE night at over 1,500 hotels.
Some of the fine print:
As usual, your bonus points on the 2 stays will be "rounded up" so that your total reaches the 8000 point level. Stays can be just 1 night long at the "mainline" Choice brands, but have to be 2 nights minimum at EconoLodge, Rodeway, Suburban, and MainStay to count for this promotion.
We'll have to wait for it to be online before we'll know whether there's the typical "other booking channels" option for high-enough elites (as there has been in the past).