Latest - if the vertical stabiliser had been hit I (as non-engineer, I hasten to add) would expect there to be evidence of impact damage from whatever had struck it (such as an engine). Also, again as a non-engineer, I mught expect there to be tearing and buckling of the surface where it had ripped free. However, I do not know how the tail surface is attached to the fuselage and so it may be feasible that high enough stress could cause the fasteners (bolt, rivets etc.) to fail and if the vertical stabiliser is strong enough this may leave little or no damage on the stabiliser itself.
Bear in mind that an aeroplane that suffers catastrophic failures may display evidence of damage that simply does not look feasible to the non-engineer but which is actually quite expected as far as the accident investigators are concerned.
So, in answer to your question, I feel that there is non significance yet - the separation has to be taken as one part of a complex sequence of events which will require much more information (such as ADR and CVR info) to explain.