Halo ODST : retail or download or both?

[Skeeuk]

thekitchensink said:
It's a standalone retail disc--Halo 3 is not required to play. It has all multiplayer maps that have ever been released for Halo 3, plus three new ones. It also has a short single-player campaighn. It's roughly half the price of the original game.

so its basically odst campain with all the halo 3 multiplayer online?

sounds a reasonable purchase if it comes in at a budget price then it will be even better, i have a feeling they will release halo odst at £29.99 and halo odst with halo 3 double pack special edition for £39.99