hi! here is (more o less) the translation of a notice published in los40.com (an spanish radio station):
[color=]"Around 13.000 people, as confirmed by the police, came yesterday to the free-concert that bj offered in front of Montjuic's Fountains in Barcelona.
A very young public, majoritary women, came to the fountains, that were permanently iluminated showing all the show of water and light during the concert (around 70 minutes long).
In the begining, the show was planned to present the song from the new album, but at last they only played two new songs, and the rest of the songs where classics as Living on a prayer, Always or Bed of roses. At last they played 13 songs in acoustic version."[/color]
all i can say is
i wish i where there. 
. anyway, i wait anxious for the bootleg... and also, if someone has the playlist, please be so kind for publish it here!!!!!!
one more thing: as far as i know, this is the longest accoustic performance they have done, isn't it?