A Request for Translation

Game of Thrones fans, is there something in this teaser I'm supposed to be excited about, or that is a dogwhistle to y'all? Because it just seems like some dudes on horses declaring "Winter is coming" when snow's already on the ground, suggesting less than impressive powers of observation:



I want to be impressed and excited, so lend a sister a hand. And tell me if the books are worth reading.