There is nothing in the rubrics of the new translation that addresses this posture, except text that lets the priest know when to assume it.
The interesting thing is that since all the postures of the faithful and their responses are contained within the Roman Missal and the GIRM, one can assume that no other postures are allowed. Neither text mentions the orans posture at all as far as the laity is concerned, so it can be said that since it is not mentioned, it is not allowed. However, people will continue to do it, and priests will still allow it, until there is a positive declaration that it is not allowed.