UPDATE: Everything is moving along as planned, a series of database updates will have to run for many hours yet. I will be heading to bed and hoping to finalize things in the morning. Depending on issues hopefully we will be done Sunday afternoon.
There will be substantial downtime all day Sunday as I am implementing a whole lot of upgrades at all levels. The downtime will likely begin early Sunday with a site lockdown, while readable the site will not be able to be edited. As the day progresses the site will likely be totally down at several points or return strange errors or nothing at all. I will try and keep updates posted on progress as well as a more substantial explanation about what pertinent changes to the site users/readers will need to know about.