I hiked from Waynesboro, VA to Franconia Notch, NH last summer, and it was a blast.
Are you planning to stay vegan the whole time? It's hard - I knew one vegan on the trail last summer, and she even broke down and ate yogurt from time to time. (there were a lot of lacto-ovo vegetarians out there, though)
Anyway, have a great time, and good luck!