Morris Proctor has written a "What's New for Logos 5 Manual"
http://www.mpseminars.com/shop/logos-training/logos-manuals/whats-new-in-logos-5-manual/
I ordered mine yesterday before upgrading and can't wait to get it. I think it'll really help me understand the new features.
I'll admit I could use some help understanding the new stuff. I know there's a lot of amazing stuff here, and I can't wait to dig into all of it, and while some of it's obvious looking, it's nice to have a tutorial to walk me through it and become proficient in it. :-)