I'm not convinced the capacity will go up much at all, if any.
Yes, the stands will be physically bigger, but...
1. Unlike the north end, the stands won't connect to the east and west stands. That's a lot of seats missing. Instead, they're doing tiered standing room only decks.
2. The huge Longhorn logo cutout of the stands removes a lot of seats.
3. Many of the seats will be club seats. These are wider than the bleachers they're replacing.
And the AD has said seating capacity will be neutral. It may add a few. It may lose a few. This is all about the money (luxury suites and club seats), and giving the stadium a more finished look. We'll also get a bigger and nicer video board.
I just hope we can get the correct color orange on the field someday.