In a short, 1-minute trailer preceding the Bastards Era, a note containing several types of cipher was shown in the video. This note is pictured below:

(Image from @747void via Instagram)

The cipher roughly decodes as follows:

Top left corner (Mary Queen of Scots Alphabet):

Massacre, the new american dream is next from the bastards. Bono malum superata cura te ipsum non loqui sed facera.. Receive peace not pain…747.

The second sentence is roughly translated to: Not to speak: but they will do when he overcame the evil by good, heal thyself.

Bottom left corner (A1Z26 ciphertext):

Truth and virtue is what we fight for. United we stand. This is the new order for our revolution.

Bottom line (morse code):

*Not officially decoded

Top right corner (obsidian cipher):

*Part of cipher has not been officially decoded.
Last word (4 characters) translates to VOID.