You can still use the original Photosynth desktop application to create and upload original photosynths.
In new photosynths, you can access the point cloud by opening the debug panel by typing the number 42 into the new synth viewer, checking the point cloud check box, refreshing the page, and entering the global camera view with the [C] key. Zoom out and you'll see the camera positions and point cloud on any Walk, Spin, or Wall synth.
I'm not too sure what you mean by 'camera location keys'.
Could you explain what you want?
If you haven't done so already, check out version 2.0 of Christoph Hausner's SynthExport, which can download the point cloud and camera positions from v.2 photosynths to view in programs like Meshlab.
If you have any other feedback regarding the Technical Preview of Photosynth 2, please share it in the Tech Preview forum here: https://photosynth.net/forum.aspx?cat=00581351-82d8-438d-a37b-7eadb3fb4991
Your fellow synther,