Now, if you miss it, or don't have a comic shop near you, or they run out of the FCBD issue (as does happen), there will be a retail edition released shortly thereafter and available on the website. The only difference will be a variant cover. Otherwise, it's identical to the FCBD issue.
In the meantime, tell your comic shop you want them to make sure you get a copy of the FCBD issue. It's going to be a good one. I think it's my strongest free offering yet, and it'll surprise some people.
I'll announce later where I'll be for the day in question. I will be doing a signing at a comic shop somewhere, but I can't announce where yet. And, if you're a comic book shop and need some kind of love for that day, give me a shout and I'll see what I can do.