[Dan296]

there. is. no. possible. way.
they arent. no way. period.
pre assembled and painted? no. thats pure speculation.

scouts as elites? again. no. thats only in the dark angels codex, because they are a GW army (IE, they will all basicly be the same, like world eaters.)
scouts are elites in that army alone (and space wolves but thats another story,) not a normal SM codex army. as for what you say about chaos, i seriously doubt your 'sources.' vanilla greater deamons i can see, because they could do something like this. one basic stat line and points cost, but then they could do-
Bloodthirster: +X points. +X A, +X WS, +X whatever. special rules for thirster.
i think it HIGHLY unlikely that they will delete the armoury sections for everyone. they could do it with dark angels because, again, its a GW army. they could do it with eldar, because they didnt have many things that could take armoury things anyway. in fact, when they added the autarch they also added armoury things! the eldar armoury was also unneccesary because, if you look at the old one, THERES NOTHING IN IT!! 5-6 things for each section. thats about it!!
as for chaos, i can see them deleting several little-used gifts such as deamonic runes or whatever, but not veteran skills. those are still in the codex.
i would also like to know what level your GW employee was working. was he actually doing rules development or worked closely with someone who did? if not, then i wouldnt use him as a credible source. a store manager? they know little, if not nothing as to the inner, inner workings.