Windows 10 launches publicly July 29.
@Dellena shared with us that SimsVIP reached out to EA to determine that they are indeed ensuring compatibility with Windows 10. tonycdh had previously mentioned it was working in a technical help thread, but it's nice to hear they are working out the issues they can. Good news for the many of us who can upgrade given 10 being free to Windows 7/8 owners.
Source (SimsVIP). A
Simguru on Reddit had mentioned several months ago that they were planning to support the launch of Windows 10, though they couldn't be 100% sure back then.