What time would you suggest getting to Ala Moana? My plan was going to AT&T Kapolei at like 4am since it's right where I live, but that might change now with reports of little 6 Plus and already a line.
Last year (with everyone pining for the gold 5S) there were about 10 people by 10PM, 20 by midnight, maybe 30-40 by 2-3 AM, and then by 6 AM, about 100. By opening at 8 AM, the line wrapped so far around Macy's I never saw the end of it, like 200-300 people.
If you really want a 6 Plus, I'd get in line as early as possible. Be prepared for mall security to kick you out around midnight, but people are courteous and have a good idea who was in what part of the line.