Nah, a very simple theory. I'm sure much think that
Here (right) are the sneak peek of the 2.0 songs. Here are:
B+D - Airplane - Skull, in the front a lock - Water and Flame - ?
And the 2.0 sneakpack (lol i know i writed wrong) can have the Water-Flame and ? symbol.
YES, NOT MORE. ONLY THIS.