Unless something changed, Seth and Neil says season 2 is happening
http://www.kdramastars.com/articles/65554/20150102/cosmos-season-2-confirmed.htm
It looks like Cosmos season 2 has just been confirmed after Seth MacFarlane has admitted that talks about what season 2 would be about is ongoing right now.
Cosmos producer Seth MacFarlane has dropped a bombshell on Twitter as he revealed that the talked to Neil deGrasse Tyson about Cosmos season 2:
Neil deGrasse Tyson also confirmed on his Twitter page that indeed, he met with Seth MacFarlane about Cosmos season 2 and that he is feeling the "Cosmos love":
This follows the reports that Neil deGrasse Tyson admitted in his lecture at Newark, New Jersey that he was meeting with producers at New York about the next season of Cosmos.
A user from Reddit recounted the events are Tyson's lecture:
"I just attended a presentation by Tyson at NJPAC in Newark, NJ. During the Q&A portion, he told the audience that he's meeting with producers tomorrow in NYC to discuss the next "season" (for lack of better term) of COSMOS. He didn't go into further detail, but thought this was interesting since up until this point the updated show was just considered a one-off series (ie 13 episodes)."