Spoiler:
There's heavy speculation that Peter's QuickSilver is actually the Marvel villian Mephisto who is also speculated to be the main villian of the whole show. I can actually buy that rumor/speculation because he does haver quite the history with Wanda/Scarlett Witch. I'm sure we'll find out soon there's I think three or four episodes left. Needless to say I'm very excited for what's in store for the MCU as a whole.