The wing itself supplies some moment about the CG. If the wing's lift is suddenly canceled , the lever about the CG coming from the downforce on the stabilizer will be greater and the tail will drop more quickly than the nose, with a resulting pitch up. But, I thought the spoilers on the MD-11 did not deploy until the nose wheel touched down - unlike the previous DC-8 and DC-10, which allowed manual deployment on the flare.
See this, where pitch up was pilot induced, and not from premature spoiler deployment:
http://www.ntsb.gov/Recs/letters/1993/A93_57_60.pdf
-drl