Yes, Talkin' 2 Myself was performed.
(I was there) It was put in after Until that Day. Nothing from the set list was removed - so it was 8 songs total.
Unfortunately though it was hard to hear her vocals for a lot of the song. It seemed mid way through A-Nation they messed with the sound for some reason (it was perfect for the first half of the show); second half though it was hard to hear the vocals for anyone with loud songs. Koda's was ok for the most part because she doesn't have a band, but Otsuka got drowned out on a couple of songs and Ayu got drowned out the most because she has the loudest songs - best song performed ended up being fated because it is softer.
Also, there was a Secret Artist on 8/25 and it was Remioromen! I love them, so that was really exciting. Also, I met up with AHS's Hiro no Kaze there before the show started. (He is going to the show today as well.)