I'll try to knock a few of the ones that I think may be FAQs out of the way first:
1) Was this always where you intended to end it?
Not always, but for a lot of its run, yes. Originally, Fates was supposed to end a little after Chuck vs. the Ring in canon, where Chuck was supposed to get the Intersect 2.0 upload because it was believed that it would override the Lincoln neural pathways (originally Intersect 1.0 wasn't supposed to run on the same pathways; that changed). Bryce, knowing that they would kill Chuck if he didn't have the failsafe, would have forced Chuck to upload Intersect 2.0, and Chuck (and Sarah) would have been forced to deal with the consequences that they weren't ever escaping government slavery.
BUT, once I changed my mind that I couldn't write a million words of Fates and go back to my original writing (the last original thing I wrote was in 2009), Italy seemed a more natural place to end it. Some plotlines were shifted around (Orion was supposed to be a discovery at the end of Part V rather than a background feature; the Intersects changed), etc. They were always supposed to get together in Italy.
2) How close was it to your original timeline?
Fates was ever-changing. I'd get an idea in one chapter, for example, and it would follow me to the end of the story. I'd say the story really shifted gears when I started talking to mxpw and he became the official sounding board. Which, trust me, is NOT an enviable thing to be. He had to deal with so much whiplash over the years, it wasn't even funny.
Plus, I don't work off of set outlines, mostly because I have ADD. Once something is written down in great detail, it gets boring. Using loose "tentpole" outlines was much more fascinating. I tend to describe events, but I'll find that while the events don't change, the motivations behind them and feelings about them do.
3) Rabbits? Really?
That was an accident, I swear.
4) Will there be an ebook?
Not just one, but two. There will be a regular Fates ebook, available hopefully this week, but I'm also working on compiling the Complete Reference Guide to What Fates Impose into a foot-noted ebook. I've deleted the original from ff-net so that I don't have any incomplete stories in my profile (apart from Curtain Call and Greater, the latter of which I have already started working toward finishing).
5) What are you going to do next?
Sleep. Finish Greater and Spies and Nerds (with quistie64). Work on an original novel that I will publish under a penname, hopefully in October. Possibly write some Castle or Downton Abbey fic.
6) Any future Chuck projects?
I have about fifty ideas, but I think it's safer to say that I shouldn't start any new ones.
7) Gonna be hanging around here?
Honestly, I don't know. I'd like to think that I will, but the blog has kind of faded away as I got deep into writing Fates and Greater:NYE and canon ended. I will say that although I promised to do a review of Chuck vs. the Good-bye and Chuck vs. Sarah with mxpw...I really hope you won't hold it against me that I have no desire whatsoever to, like Sarah Walker, ever remember those episodes. Frankly, I don't wanna. Don't makeme.
Anyway, ask away. Anything you want: why I picked a storyline, what something meant, why I did what I did, what my favorite/least favorite things are, etc. etc. Let's make this a true free-for-all.