If your Legacy account is from a 1.0 Collector's Edition, you get them without having to do anything,

If your Legacy account is Standard Edition, you can purchase an upgrade instead of a 2.0 CE for the in-game items.

If you buy a 2.0 CE for PC, you can't add it to your Legacy account. However, if you buy the 2.0 PS3 CE, you can add it and you will get the in-game items, but you do need to do the registration on a PS3, so you have to have access to the console.

Hope that helps!