In recent usage, the phrase signing statement has referred mostly to statements relating to constitutional matters that direct executive agencies to apply the law according to the president's interpretation of the Constitution.
You might need to exercise a little bit more patience. Though Microsoft (MSFT, Tech30) said a month ago that Windows 10 would become available on July 29, Microsoft clarified on Thursday that everyone won't be able to upgrade on that day. Microsoft will roll-out upgrades slowly, in waves.
The coming over-the-air update for existing Windows Phone users to Windows 10 Mobile is now going to start in early 2016, according to an updated statement from Microsoft on December 17. Today's updated availability statement from a company spokesperson: