What a wild change. Completely realigns everything we've been assuming. If Karlin really does have two full city blocks under control, I'd say the 1000 room hotel rumor suddenly is a lot more feasible than with the previous footprint. Even the podium seems built up enough to suggest meeting space/ballrooms.
And if this is a new concept (not from a year or so ago, as H2O guessed), then it's also suggesting the shape of the new CC. Check the pic below from the flipbook. They're not only showing the Railyard, they're also showing a completely flipped and reconfigured CC alignment. In this pic, the CC goes east-west, not north-south between Trinity and Red River, and 3rd and 4th; there are ghost renderings on the current CC land along Cesar Chavez; there's a re-established street grid, and a paseo under the Railyard (rather than the CC) at 3rd; there's an expansion of Palm Park on two city blocks going east; and that park view is NOT from Brush Square, but from that new portion of Palm Park. And there's even a separate ghost tower attached to that new CC building, across from the Hilton.
I think I'm actually talking myself into the idea that Karlin is partnering with the CC to be part of its expansion.