~MechMech~
Don't necessarily know if this counts as speculation, but here's another supposed "spoiler" for 312 found from avatarwatch
"Aang meets with Jeong Jeong, who reveals major revelations to Aang about the surviving airbenders, and to Iroh and Zuko about the true nature of Lu Ten and Azulon's "deaths"."
...*HEADDESKHEADDESKHEADDESK*
Oh man I'm gonna die.
Not so much about the surviving airbenders... but more about Lu Ten and Azulon. Mostly Lu Ten.
...My priorities are really fcked up, aren't they? Yeahhh. I'm valuing the story of two dead dudes over the possibility of an entire civilization being alive...