Much of the following information is gathered from various articles, interviews and message forums. As such it can be considered RUMOR and subject to change or otherwise inaccurate. The webmaster's comments are found in the italicized brackets.
Episode 12: Our Father; 12/8/08 11/15/08: Sylar will "acquire a unique power" that will help shed some light on what really happened to Sylar when he was a child (in other words, whether Angela really did try to drown baby Gabriel as Arthur said). From Behind the Eclipse Week 6 CBR Article 10/15/08: Two characters go back to the rooftop scene when Hiro's father gave Claire to HRG "and see a little more of what was going on." From Behind the Eclipse Week 2 CBR Article 10/11/08: Added Episode title. From Behind the Eclipse Week 2 CBR Article
Episode 15: ; 2/9/09 11/15/08: As of October 25th, this episode was being filmed. He describes it as a "Guantanamo Bay kind of a situation. We've all bagged and tagged and we're on our way to being killed." From Greg Grunberg Interview 10/29/08: Guest character that holds over from episode 314: MILITARY PILOT: 30 - 45. MALE. This military pilot is involved in a top secret government operation. PLEASE SUBMIT ALL ETHNICITIES. CO-STAR / WILL BE NEEDED IN EP. 315 AS WELL. PLEASE CHECK AVAILS. From Casting Calls
General Spoilers for future seasons: 10/17/08: "Stay tuned" for a couple of more years for elements influenced by the Myth of the Nine Unknown Men. From Behind the Eclipse Summer CBR Article, Part 2[That means it'll be a while before these elements might turn up.] 10/17/08: The golden key that Adam was reaching for in the vault in the season two season finale will "play pretty huge into season 7 mythology." From Behind the Eclipse Summer CBR Article, Part 2[Assuming this was a serious answer... and assuming there is a season seven.]
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