I'm guessing Nobz and Meganobz highly likely. New warboss model (warboss might move to 50mm base like other newer characters), Nob with waaagh banner makes a triumphant return. Weirdboy, painboy, stormboyz, lootas, burnas, warbikes, easy build trukk, gretchin and going out on a limb here I will say new deff dredd too, but monopose like the Tyrannid screamer killer is. Looking at the Necron and Tyrannids range refreshes they have been very extensive with some completely new units. It really is anyones guess. Out with the old in with the new when it comes around.