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.
1 For Windows 10, Microsoft will continue its traditional 10-year support lifecycle. 2  The five-year mainstream support phase begins with the release of Windows 10 on July 29, 2015, and a second five-year extended support phase begins in 2020 and extends until October 2025.