Will there be specific guides for upgrading from specific prior versions?  From what I had read, I thought the main difference between 1.5 and 1.7 was a jQuery change - but if there is more (such as DB - which I gather has changed), will there be clear upgrade/reinstall procedures written up?

Props go to Cash for his write-ups - I will be relying on them religiously when the time comes.  That said, I'd love it if we could document test upgrades and share them here.