Olympus Europe made a mistake: The E-PL5 has same AA filter as the E-M5.
Now Olympus Europe admitted that this was a wrong statement. They now corrected the E-PL5 specification info on the official website and confirmed that the E-PM2, E-PL5 and E-M5 do have the same sensor and the same Anti Aliasing filter. Source: Lepidi (translation here).
Yep, even big companies can do mistakes sometimes. But I am surprised that it took one month(!) to get and admission of error. Oly, you can make it good by leaking us some good news about your future products :)