Haha, We have the same birthday! :D
Hmm...I'll try and answer them best i can.
1. It's meant to be a "radioactive coloured" shade of green, to tie in with the nuclear power plant and the UK edition of the first book, I think. The trailers are kinda lazy like that, forgetting pretty big details.
2. I think so. Theres no mention of it ever being tangible.
3. Yep. it's official. *FAN SQUEL AT ITS GLORY*
4. We haven't see the back cover yet, but I imagine Astrid and Caine, seeing as Diana and Sam are on the front and together they'd make the "big four". Thats my theory anyway.
5. Yeah, I noticed that too. I suppose the malnutrition gets to them pretty early on- plus the Californian heat.
6. I hope they will. However, there is a lot to fit into a 500 page book. I suppose there wasn't much room for every preceding character. I also think that a lot of these "side" characters and only really used to support the prominent characters like Sam, Edilio etc. Once they help move the central characters forward, they are no longer useful to push the plot forward. For example, The Siren was a character created for Orsay's plot development. Now that Orsay is dead, she is no longer relevant. Although they did mention her once in PLAGUE, briefly. She was one of the kids who went to Lake Tramonto with Sam.
7. Actually Langit, it may very well not be. MG has shown interest in a FREE, downloadable spin-off for the fans, short, snappy, only a few hundred pages long, detailing what happens to the survivors after the FAYZ walls come down. It'll be on kindle only, but currently is only a possibility. He said he only wanted to release them if fans were interested.
8. Not personally. I met Valerie Bloom, but i dont know if anyone here has heard of her...She's a brilliant author, however!
9. It's was originally, the power to recognise someone destiny- if someone was special, she'd see a "streak of light" in the sky. It was a 2-bar ability, which was mentioned briefly in HUNGER and then dropped completely in LIES. this is because MG didn't think it was "that interesting", and was a very limited power.
Hope i helped! :)