Just to throw a little fuel on this fire, I recently started up a random conversation with someone in the know who I overheard exuberantly discussing the recent SpaceX RUD at a restaurant. Turns out this person seems quite credible with access to the inner sanctum, but I will not go further to identify. This person stated that the MX line is ready and waiting, and that betas have indeed been produced. He alluded to this summer as being a rather arbitrary time for roll-out, stating that Elon and his engineers wanted the dual motor format to get some more real-world testing before releasing the new vehicle, citing sleep mode as a reason why this was felt necessary to start with. All makes sense to me, and this person was of high credibility IMO. No details about the release date of the beta