again, i'm another for the 'no' camp - sorry guys!
as i've spent the better part of a full year collecting bitz and stuff before starting on my lamenters, i'd be pretty upset if gw all of a sudden released an 'early mk power armour' set that included bitz for beakies, heresy, maximus and iron armour style marines!
and there's still going to be some very hefty conversion work for my lamenters as i'll be needing to make lots of mk5 & mk6 studded areas like the shoulder pads and legs (for the mk5!)
i look at it the same way as i do for my guardsmen and their berets; while my mate was cheesed at first that i'd copied his idea of an all beret army, he doesn't really mind as i took the time to green stuff 90 or so berets!
now if gw suddenly released a sprue set for the guard full of beret heads, i'd be truely upset as every little kid and their grandmum will now have beret wearing guardsmen! (in essence, all my hard work has been for nothing as my army would no longer be so truely unique!)
so, while yes, it would be nice to have a sprue set for the earlier mk power armour suits, i personally feel it would be a real kick in the face to pretty much every dedicated modeler that's ever taken the time and effort to convert up a full army
cheers!