They can't download shit yet. IGN already bitched about Halo looking "meh" on 360, without reading the fact that the "upgrade" doesn't happen 'til you get the software from Live. Or asking anyone. Or checking facts. Ironically, they link directly TO that fact in their piece.
The 360 supports "basic" Halo and Halo 2 compatibility right out of the box.
The 360 supports "basic" Halo and Halo 2 compatibility right out of the box.