That’s what you get for buying a Mac
It isn’t that they are going to introduce something super-new: remember, these are just entry-level things. Just a decent video card will run you that amount, and that won’t even be top-o’-the line - those cost up to about $600. A first-rate system will cost about $5000.
P.S:
My E-Machines computer was only about $400 (purchased last November) and came with twice as much memory (both RAM and HD) as the listed computer, as well as speakers! The catch: video card was sub-standard.