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.
A new upgrade process. In the run-up to the release of Windows 10, Microsoft made a surprising announcement: until July 29, 2016, home users of Windows 7 and 8.1 can upgrade to Windows 10 for free. After that date, late adopters will have to pay $100 to $200, depending on the OS version.