Here are some details from a reader of the site that has viewed the commentary and as soon as the video is available we will post it:

This is probably a spoiler, but here goes…I was just watching the commentary of Cold Snap on the Heroes website, which featured Masi Oka and Bryan Fuller himself. Bryan Fuller bascially revealed three things, so these are coming from the writer himself. Number One, Tracy is not dead, the blink was added because the creators on the show didn’t want to create another death that had no consequences, so they wanted to establish that Tracy wasn’t dead from the get-go. She basically gets away into the drain. Second, Daphne is dead. Masi asks Fuller point-blank and Fuller confirms that Daphne’s death is permanent. Third, Fuller basically spoiled part of Tracy’s storyline for next season, mentioning that Micah’s little speech to her in the parking garage is going to be the kick-start for her to become a better person, a leader of the good guys. So everyone who is pegging Tracy to be a villain now…not so much. Sounds like she’s going to come back in a capacity similar to Micah, helping to guide and protect other powered folks.