In the past, Sandhill was about the last catalog to update. I think last year it happened a bit quicker with their new website.
As Carolyn said, it literally is a Mom and Pop style operation so you just have to roll with it! They are great folks doing great work. I just can't wait until I have room to get some of their heirloom chickens!
Glenn is fine having you order early from the previous year's listing - things don't change that much year-to-year and if you don't mind a substitution if the occasional variety had a poor crop, that's a way to get your order in early.