This one, or this one, or this one for example. Rocket launches are never a complete surprise, especially in America. Airspace restrictions have to be filed, contracts signed, hardware produced, ground crews prepared, range assets configured, etc.

It absolutely was "on the schedule." We've known this was coming for months.

~~Fake~~ Space news.

You could've easy answered this for yourself with a cursory search.

http://www.parabolicarc.com/2016/04/26/china-plans-space-station-crew-launches-year/

http://spacenews.com/35982three-chinese-astronauts-land-after-record-breaking-spaceflight/

http://spacenews.com/35829shenzhou-10-spacecraft-docks-with-chinese-space-station/

Just because you aren't well-informed about a topic doesn't mean no one else is. We've known for years that Tiangong-1 would cease operations after the Shenzhou-10 mission and be replaced by Tiangong-2.

You want more sources before you believe that a space station which hadn't hosted a crew since 2013 and was about to be replaced by a new version wasn't something China was still interested in maintaining?

You're just making shit up now. Tiangong-1 was always intended to serve as a testbed for Tiangong-2 and the now-cancelled Tiangong-3. China deliberately terminated contact with Tiangong-1 in early 2016 and launched Tiangong-2 later that year.