The first boxed set has just 4 classes and 4 races and three (or two) levels of play. Presumably each class will just have one or two builds with predetermined choices (but this is just speculation).
Are you sure there is not some kind of confusion?
I have the impression that essentials is going to be something different than 4e. While compatible with certain things it would still be different.
That's pretty much what we've been told - I'm sure we'll see for ourselves in time, but nothing indicates this is a seperate game in anyway.
Do you have any links? From what I have vaguely gathered I got the impression that it is a somewhat separate game line.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.