2. I think Annalise already did the favor, though I don't know what it was. Watch the newest episode, the 2nd one, they talk about it like it was in the past. I also somewhat think Bonnie might kill herself. I thought that about Connor too but he's seen in the "flash forward" at the end of the episode.
3. He's definitely positive :( (in the second episode Oliver hacks into the police records after they run DNA tests on Annalise's clients and he helps Mystery Inc find out the police "switched tests", though they didn't really switch anything, they manipulated it. So maybe the YouTube is confusing the two.)
I'm debating with myself on if they are going to kill off Annalise or not, which the flash forward implies they will. This whole series is based around her, surely they wouldn't kill her off in the second season. Right? Maybe if it was like the fourth or fifth season but not the second. I feel like there are so many plot lines that she has to be involved in before she dies and leaves the kids to piece things together themselves. Also, I kinda think she planned her "death" that is shown in the fast forward but we'll see.