My friend Joe has to deal with the problem with on his realm and therefore made sure to ask his designated Blizzard representative when he attended the Laguna Art Museum benefit dinner. Producer Carlos Guerrero replied that they needed to upgrade the hardware on the affected realms in order to allow more instances to be launched at the same time. Presumably, that is what the extremely extended downtime was for on Tuesday.
So my question to you is, did it work? Are you meeting the Door Boss with the same regularity, or are you able to enter instances more frequently now that your realm has been upgraded?