You still have the warbands, and you still have all the fluff they just relaxed the rules a bit.
As far as Orks go, they went more like Dark Angels. If you take one warboss you get bikes as troops, take another and you get some different choices, etc. But by and large it;ls all the same list. No special rules just for certain groups.
Speed freaks are basically folded into the regular ork book.
A lot of chaos players had problems with losing the special rules, but when you think about it, it made for a stronger list. For example, your Iron Warriors can have berzerkers now (They can be mercenary World Eaters you hired for the mission, or you can simply call them combat cyborgs and have them count as zerks) etc.