One user from Baidu went to the concerts last weekend.
He bought Shhh! - and from his pics, there are other motives now for the 7 photos you can get when buying the single.
According to him a lot of people attending were buying the single after the show (he also posted pics).
That's most probably the main reason, why we won't get a new release before the tour ends. The single still sells.
Btw. he also met her male dancers afterwards. You can take a look on his post here, big thanks to him:
http://tieba.baidu.com/p/4727904863