You won't get the special armor from the pre order, but you if you don't feel like buying the DLC, you can add the following lines to the end of your `XComGame.ini` in `C:\Users\<user>\Documents\My Games\XCOM - Enemy Unknown\XComGame\Config`.

    [XComStrategyGame.XGCustomizeUI]
    bArmorDecoAvailable=true
    bArmorTintAvailable=true

This will allow you to get the color customizations without the extra armor.

Note: Ensure there are no trailing spaces after each line after you've pasted them in.