Halo: Reach will be Bungie's grand finale to the series, at least as far as it is concerned. As in classic Halo fashion, there will be several SKUs for Halo: Reach buyers to choose from. There's the regular edition, the limited edition, and the crazy expensive Legendary edition.
Bungie says that this time around, the Legendary version will be truly limited in supply (in my neck of the woods, Legendary editions of Halo 3 were clearing out at under $20 a few months ago).
Everything you need to know is in the video below: