Yes, it will replace what we’re calling the “legacy apps”.
Here’s what the new obs page looks like if there’s no location. The buttons at the bottom are grayed out:
And if you try to submit the observation anyway, you get a warning:
You can still submit it, but not without being told it’s not complete.
I did make a mistake earlier when I said you’ll see a pop-up if you try to save/submit an observation without an ID - you can do that.