From Richie Furay's Facebook page, posted 6/29 at 7pm:
"For those of you getting excited about the Buffalo Springfield fall tour - word has just come to me that it has been moved to the first of next year. I'm not going to spend a lot time here with details as you speculate among yourselves - there's nothing to speculate about, the tour has simply been moved."
Haven't found any news beyond that. If I had to guess, Neil's being his infamously unreliable old self again (I love the guy, but he's a weird human being sometimes). Just a guess though.
Such a long, long time to be gone
and a short time to be there.