I’m currently a user of 1.8 and I’m thinking of upgrading to version 2.x. I’m working on a project in China and need to use Open Street Map not google map. Google map coordinates are not accurate because china require googlemap to show a degree of error. So all my pins are in the wrong place on open street map after I upload my pano tour.
If I pay for the upgrade to version 2 will I be able to see openstreetmap in the UI?

It appears you can - see screenshot.

But why not download a trial version and try it for yourself?