We will be working through the weekend to get the site back up as soon as possible. Yes, this upgrade is for our trading engine which will reduce the amount of 5xx errors. It is taking so long because we want to make sure the upgrade is rolled out safely.
As for that update, we fully understand the serious nature of this upgrade. Our dev team was working for 20+ hours straight at the time of that post, and may have been a result of sleep depravation.