If I get AC:Brotherhood's Steam Base Edition, will I be able to upgrade it to the Deluxe Edition?

Darn.. Thought so...

Well, this is not an "upgrade" though... If I remember correctly, Steam had (has?) an option for upgrading to Deluxe Edition the Stardand edition of ACII. Ah... Well, now I need to find 2 more keys... Or 14 ref. Darn.

Just checked. ACII has still an upgrade to Deluxe Edition. Revelations don't have a "Deluxe" Edition, but the Gold Edition, which is more like the base game + all the 3 DLCs, so since the DLCs are sold seperately, there's no reason to have an upgrade, even if it would be cheaper. The thing with Brotherhood is that it has exclusive content, like the soundtrack, but the thing is, but still, these exclusive content as easy to get... I mean, in the ACIII and ACIV games, the Deluxe Edition gives Playstation-exclusive missions, so that's why they are not upgrade-able, but Brotherhood has nothing like that... Also, ACII has an upgradeable Deluxe Edition option because it is like Revelations, Base game + 2 DLCs, nothing "exclusive". I will see what I can do with UPlay support.