According to the Hollywood Reporter, BitTorrent users who downloaded the movies illegally could get a nasty letter from the "U.S. Copyright Group (USCG), a Washington D.C.-based group of attorneys that has obtained the IP addresses of thousands of BitTorrent users and has begun suing them for downloading other independent films."
And they already have a list of IP addresses of persons who likely downloaded the movies! Yikes!
Watching a crappy downloaded version of 'Avatar' can never compare to seeing it in theaters or on Blu-Ray, so skip that potential lawsuit, cough up the $20 and buy it on DVD.