No offence but it's a tad too early to be releasing information on Blu-Ray and DVD features for a film that hasn't even seen its theatrical release yet.
It also strikes me as a little odd that a random DVD company from France is the only one releasing this information.
It's highly likely that somebody that works for 'DVD en français' is a Prometheus fan absorbing false information OR a Prometheus fan contacted them with this "exclusive" information.
A lot of people are under the impression Ridley Scott mentioned 20 minutes being cut from Prometheus. He was referring to 17 minutes from another film.
To me, this is a case of broken telephone.