Just looked. I show the Lumia 620 (in various colors) at #s 1, 5, 14, 15, and 27. So, 4 of the top 15 slots and 5 of the top 27.
In some ways, I am more excited about this model than the 920. Don't get me wrong, I love them both. But the 620 seems to hit a sweet spot in terms of a low enough price that someone might actually buy them unlocked, or unsubsidized.
Those that have the money to spend on a high end phone won't be tempted to step down to a 620. Those looking to save but that don't have a very restricted budget might buy it instead of a 920 since it's about 1/3 the price. Comparable phones to the 620 sell for the equivalent of about $110 in both China and India. That's cheap here, but not there.
So most likely it will be popular among status seekers. What amount of potential market share would you estimate that to be?