Oh cool that's all new stuff there that they showed at the June 7th meeting.
What you circled there is the Riverfront District. They plan to have very large hotel towers facing the river in that area. I would say that the mock-ups there would be in the 500' - 700' foot range. As a point of comparison, most of those shorter buildings in the residential area surrounding the "Boxcar Parks" are probably between 60' - 90'.
And now that I checked the official site again, they've updated a couple slides there too -
check it out.
and check out a much larger version of the above pic
right here.