[Unconfirmed Info] BIGBANG to preview new single at Shanghai event?

According to posts on Weibo, BIGBANG might possibly preview their new single at a Gala in Shanghai. Furthermore a special guest is expected on stage and Angelababy has been mentioned.
Details on the event can be found here:

Friday, January 30, 2015
BIGBANG at Shanghai Media Group Gala Shanghai 

(*preview:  a teaser of the song, maybe one verse)

Post on Weibo (via @mystifize on Twitter):

Please note that there is no official confirmation on this (as yet).