I am guessing things didnt go smoothly since it is almost 4:30.
Whenever you hear "data center is doing a large number of upgrades" with a time frame of a few hours, it's always best to translate that in your mind to "it's gonna be down for a few days". If it's not down that long, it's a pleasant surprise. But data center upgrades and storage migrations are always a headache and the chances of something going wrong are much higher than them going right..
Uh, yeah, I know... That is why when I go into a site and am planning on taking down a whole network (for example) I tend to under promise and over deliver.
Not a problem I figure it will be monday or so since they may have issues they didnt account for.