Proportionally each account forge with the same rate. No matter how coins it has.
If talking about this particular 10000 reward, most _probably_ it will go to the `middle class` holder. Just because stakes of `poor` holders are too small, and count of `rich` holders is too low.
I don`t remember how IPO listing looked like, but most probably again, it looked like most of things in our world - as `normal distribution`

But from other side, we will see normal distribution of bonus rewards only after they will happen in a quite a lot quantity.