Last year we got AP rates in March that were roughly 30% off the rack rate. We did two nights at CSR, $124/night (vs. $184 rack rate) and two nights Poly, $318/night (vs. $449 rack rate). It's peak season, so there are fewer rooms available at discounts - you have to reserve early. The rates came out in January.
Edited to add - I would not expect any discounts for the week around Easter (March 16-27). In fact there's a higher holiday rate charged at most WDW resorts for Easter week - $10 to $20 more per night than peak rack rate.