Yes, funds are moved from estimated to confirmed on block confirmation. The estimated contains funds from the current round and any previous rounds not yet confirmed.
Yes, I can see how that would be confusing. I've been meaning to re-label those to make it clearer.
One reason we removed the unconfirmed section is because, unlike some other payout systems, "unconfirmed" doesn't really make sense. Neither does "confirmed" or "estimated" actually. In ESMPPS you will (eventually) receive full face value for your shares. So, there is really just a concept of "Available" and "Pending".
For a short term clarification to the problem, I've renamed them as such. Though, the idea of being able to see how much of your Pending balance was generated this current round isn't a bad idea at all.