Momochi and Yurina at some nico nico stream today:
http://www.twitter.com/?d=JTVZ0LKFThey did some short talking, did show the PV, then had some quiz/game with 3 parts where 3 people were called (randomly via the new nico nico denwa application or something), each person one part.
The person had to predict who is going to win (either momo or yurina) and if he/she was right they were going to win a signed heroine ni narou ka poster.
Of course everyone won and got the poster~ they also got some personal ...kind of.. message from momo and yurina and were allowed to give them a short message as well (they basically all said ganbare for the concert tour that starts tomorrow).
You won't see some of the fun in the video since the comment stuff is put on top of the video (isn't actually part of it).
For example Yurina wrote once ヒロー印 (heroinn) instead of ヒローイン (heroin) or writing 8888887788888 instead of 88888888888 (clapping) and sometimes they're just reacting to the mass of comments.