If Heath’s story is indeed picked back up, it seems probable whatever follows has to be tied to that “PPP” card that was left behind.
Some believe it’s a clue concerning where Heath is currently, while others have guessed it’s a message tied to symbols used in music.
Given one can never predict what the writers are planning, that might actually be the better option.
The mysterious card Tara found was the subject of much speculation when it appeared, with various theories regarding its meaning popping up all over the web.