I know it might be a while until we know exactly what it will be used for, but we already know it will be used in some kind of alloy. My question: any hints on if we will need thousands of it (like sss) or just a few (like samo)?

We know it is pretty dense, so like gold, a little might go a long way.

Any theories (from the the community) on what it might be used for?

probably in mass production of a heavy alloy.