Had a good talk with one of the lead engineers today about the trains and new engines. if you'll recall, they bought 3 engines- one being the twin to current 76 and one the twin to current 13, along with another. The original plan was to use 13's twin for parts. Well, that's changed a bit. Here's my understanding now of how it stands.
There was one engine that didn't match any of the current ones. You can actually see that one now when going by the round house. It looks nothing like the others, and is not a steam engine at all. It won't be used for pulling the trains, but is very useful for moving around cars on the tracks when they need to, or doing track work, along with other uses. So it is currently in use.
13's twin, which they originally thought they were going to use for parts, they changed their mind and it is currently out of state receiving a major overhaul so that it can be put into use later on. So it will actually be running in the park sometime in the future. No eta on when.
76's twin is in the last stages of it's overhaul and updating for use. You can actually see its tender car sitting by the round house. Yes, it has a tender car, and yes, it will be used with that engine! You'll notice the tender car has a different paint scheme as well. They are hoping to have a grand unveiling at some point in the future, but not sure when as they want to make sure they have all the work done, and that's tough to do with the operating schedule. But it's getting close.
They're hoping to get some room added to the round house, but not real optimistic on the expansion that it's going to really need.
and, of course, all of this is subject to change at any time, so take it for what you will. But I was very excited about the future of the new engines and the train. :-)