It could also be quite possible that Jon Snow himself finds out he’s a Targaryen this episode, and the title is an explanation of his true identity. In retrospect, he is a dragon and a wolf all at the same time. Lyanna was still a Stark after all and Rhaegar was a Targaryen – making him both wolf and dragon.
Twitter, of course, has their own theories:
https://twitter.com/Flasheart88/status/900314709659762689
https://twitter.com/KlNGTAEYEON/status/900314818715856896
John Snow is both
"the Dragon and the Wolf"— A Man Like Me..! (@ishaqmamii) August 23, 2017
https://twitter.com/CharlieWisco/status/900063614605942784
Game of Thrones finale is called 'The Dragon and the Wolf' … Jon and Daenarys sitting in a tree, not even knowing that she's his aunty.
— Adam Valentine (@AdValentino) August 23, 2017
https://twitter.com/AustinCTweets/status/900108611866816513
#GameofThrones, Season finale "Dragon and the Wolf", Jon and Dany.
I think Jon Snow will finally "Know Something"— bmimam (@bmimam) August 23, 2017
The final episode of #GameOfThrones season is called 'The Dragon and the Wolf' hear me crying bc you know what that means pic.twitter.com/VnDaSwEmTs
— Valerae!💌🦋 (@valerae_) August 22, 2017
the wolf and the dragon refers to rhaegar and lyanna, jon and daenerys, and jon being both a stark and a targaryen pic.twitter.com/yuoXMz7eLZ
— ❤️🔥 (@lovequinne) August 22, 2017
https://twitter.com/wrennzero/status/900064782346108928
What’s the true meaning? We’ll just have to wait and find out – in 80 f*cking minutes.
Can you say – hyped?!?