Sony has never said the PS4 is going to be DRM free.
How about you re-watch the announcement, instead of reading how journalist have incorrectly interpreted it.
listen to the precise wording of Tretton’s first statement, the first one that stirred the crowd.
‘Playstation 4 won’t impose any new
restrictions on the use of PS4 gaming’.
Please feel free to point out where he said "DRM FREE"