Hi there, all,
When I enter Photosynth 2's global camera view (type the [C] key when viewing a synth) I can immediately see the camera frusta from my synth as well as the polygons that the current photo is being projected onto.
If you type 42 into the viewer, you can activate the debug panel and check the 'Point Cloud' check box, however unlike the other check boxes which seem to have an immediate effect on the viewer, the point cloud option doesn't usually make the point cloud spring into view.
For some time I didn't think that I would ever see a point cloud on a new synth, but after a while, I finally saw one after entering and exiting global camera view multiple times (using [C] several times).
It seems to me (though I may be mistaken) that the preview site/viewer remembers whether I've checked the point cloud option between synths - that is, it seems stored with a cookie, whereas other options all reset to default between synths.