I've seen pictures of these wash's been used. There is actually another company aisde from GW bringing out someting extrememly similar.
I've also seen te wash used first hand. Its incredible. I dont know if its a good thing or a bad thing. :P Its definetly good for getting really fast awesome looking models done. You simply basecoat the model and apply the wash, and it does everything. shades tones and small highlights.
This does mean that anyone can produce top standard paint jobs but what does this mean for painting competitions and golden demon etc?
while these do mean youre models look awesome with little effort, im one of those hobbyists who like to sit back and would rather paint an awesome model by hand with all the little details rather than just slap on some new wash to have it done fast. this is just one problem i find with the new washes, but dont get me wrong, they are a god send for fast top quality, and i think, the best thing coming out to accompany horde armys :P
(go go fast tyranids, Skaven armies
)
Just a quick over-view of my two cents on the matter lol.