I too just received the e-mail pasted just above. I had/have applied for renewal and received Conditional Approval just under two weeks ago. I assume that that is what triggered the e-mail to me now, since I had heretofore been unaware of this program (or this thread!)
Anyhow, I have been trying to stick to the letter of any and all instructions, and at least one thing I read was that, having been conditionally approved, I should make an appointment within 30 days. I understand that the interview does not have to be within 30 days, but that I should make the appointment by then. So I made an appointment, before an upcoming domestic trip later this month.
This arrival program sounds better, however. My next international re-entry is in October. My question is: If I cancel my current scheduled interview and wait until October to take this unscheduled "unique opportunity," is there any chance that I will have messed myself up in the system? In short, have any of the rest of you canceled out a scheduled interview to take advantage of this?