The name alone should be a clue to Apple's intent. The MacBook line was discontinued back in 2010. The MacBook line consisted of the (basic) MacBook and the (more powerful) MacBook Pro. Later they added the more portable MacBook Air.
The resurrection of the MacBook name would, at least to me, indicate a lower performance, entry level computer. Apple took the basic design of the MacBook Air and created a retina screened, fanless version. Battery life is fantastic, and the compromise, if any, is in the Intel M class processor. While I would not want to render video on this machine, it will perform the basic email, word processing, internet surfing tasks with power to spare.
I see it as Apple going after the entry level market again with the new retina MacBook laptop. This is the perfect computer for my wife and most of my kids.