I am really glad they are including the alternate version, but............
Looking at that youtube link----of the 9:51 running time you're getting about less than two minutes of new footage---less than 45 seconds if you exclude the opening and closing credits and less than 30 seconds if you exclude the litle 'act II' overlays and one (1) actual new line of dialogue.
It's nice to have, but not really any great addition to star trek lore.
I mean in 1986 when they aired the uncut 'Cage' we saw about 15 minutes of new footage. That's
an alternate cut.