A couple of days ago the author of TicketBox pushed a new update that enables you to save securely the SHSH2 tickets for iOS 10.2 and iOS 10.2.1 (no update needed) for any device, including now the support for iPhone 7! The SHSH2 tickets are saved with the ROSI tag which makes them valid for future downgrades.
iOS 10.2 will receive a Jailbreak! Luca Todesco has confirmed iOS 10.2 will receive the Yalu Jailbreak update (even tho not for iPhone 7).
Despite the fact that the iOS 10.2 Jailbreak won't work with iPhone 7, Todesco released a warning saying you should stay on 10.2 NOT 10.2.1 as the Kernel exploits are working on 10.2.
It is still not too late to go back to iOS 10.2 if you updated to 10.2.1 but hurry up! The signing window can be closed at any time.
If you are on iOS 10.1.1, then you are on the best firmware regardless of the device used. Don't update. Saving SHSH2 for iOS 10.1.1 is no longer possible as you can only save the tickets for the currently signed iOS version.
TicketBox Update: http://bit.ly/2kvHhee
Saving iOS 10.2 Blobs with tsschecker: https://www.youtube.com/watch?v=T6O5K-0fMgg
Saving SHSH2 on WINDOWS: