http://www.forbes.com/sites/bigbang...try-an-interview-with-oneplus-ceo-pete-lau/4/
"We are going to launch two products this year and we have set our goal internally at 3 to 5 million units. "
"This year" is vague, but suppose they meant in the current calendar year 2015, so that's 3-5M in 6 months effectively which = 500K-800K/month.
But then also read:
"But the volume is not our priority. Our goal is to receive continued positive feedback from our customers. We sold one million units last year, and we have a very good reputation. I’d like to sell 3 million units this year with positive feedback rather than 5 million this year but with some degree of negative feedback."
So that implies a cautious initial quantity, wait for feedback and then tweak, then ramp-up.
So there may be an initial release, a pause, then a ramp-up.
So if there is a ramp-up, i.e. factory halts, wait for users to flag up build issues, tweak the hardware, then resume, that needs a good 1 month pause. The flipside of a pause though is 1 month of 1.5M people moaning about waiting for invites....so.....
As for the very first initial launch Aug 11th released handsets we have:
https://blog.oneplus.net/2015/07/the-oneplus-2-invite-system-new-and-improved/
"We’re talking about 30-50x last year"
So what we observed was "Early members" = about 1K last time (roughly) so about 30K-50K this time.
It would be cash wise, image foolish, to release those 30k-50k units and wait for owner feedback and then resume building allowing for feedback. The issue in that pause is >1M people moaning for weeks venting about waiting for invites. Not an easy set of decisions there!