Nothing has changed. It is still controlled by the Local Security Policy (Security Settings -> Local Policies -> Security Options):
Interactive logon: Do not require CTRL+ALT+DEL
This security setting determines whether pressing CTRL+ALT+DEL is required before a user can log on.
If this policy is enabled on a computer, a user is not required to press CTRL+ALT+DEL to log on. Not having to press CTRL+ALT+DEL leaves users susceptible to attacks that attempt to intercept the users' passwords. Requiring CTRL+ALT+DEL before users log on ensures that users are communicating by means of a trusted path when entering their passwords.
If this policy is disabled, any user is required to press CTRL+ALT+DEL before logging on to Windows.
Default on domain-computers: Enabled: At least Windows 8/Disabled: Windows 7 or earlier.
Default on stand-alone computers: Enabled.
Be careful because the policy is a negative. Default of "Enabled" means that the user does not need to press Ctrl+Alt+Del... and this has been default for some time. You can set the policy to "Disabled" and then CTRL+ALT+DEL is required on Windows 10 (I just tested it).