SamC130;
Re, "If it's going to occur, it will most likely be during the takeoff roll when aft Gs are most prominent (and they're not that much.) The Gs experienced at rotation are positive, not aft."
Correct.
The longitudinal g's on takeoff are in the order of 0.3 +/-, and on rotation the vertical g is similarly small, around 0.05 to 0.1g bearing in mind that for most aircraft types the accelerometer is placed near the center of the fuselage, (gear well area), although unless there's a recent change, the B777's is mounted in the cockpit.
As we would know, the longitudinal 'g' would be higher than '0' due pitch angle but again not very high. Of course it would be the tied-down mass affected that provides the potential energy against the restraints and not high longitudinal 'g' loads - again, easily understood.
Regarding stall procedures, manufacturers and SOPs, most contributors here who fly likely have a solid working knowledge of responses etc given the extensive treatment of the subject on the AF447 threads,
.
The recorders have likely been read, (they should be in good shape) so I'm optimistic we'll hopefully soon know what happened.