There's going to be much more then 3 teasers. While I usually say expect it release to be somewhere between October to December, December is the most likely.
that leaves 6 teasers minimum, 3 per month. If he releases first thing December. If past the 1st, that's 7 teasers, past 11th is 8 and past 21st is 9 teasers possibly left.
Why won't we try to apply some logic into here:
First lets establish the fact that renders and animations always represent around 90% of the status of an update cycle while the 10% thats left as an estimation space left for writing.
There are 16 teaser sets posted as of today starting from March 21st of this year.
After some brief calculation each teaser which represents 10 days of mainly visual development period equals
4.67% of the update assuming setting up the scenes started at around March 10th (first teasers at March 21st).
Now again the process of posting Bi-weekly teasers stops and a long silence starts (writing) at around
90% according to
Ch 9,10,11 we can probably assume that would be such a case here again so end of teaser cycle =
90%
10 Day teaser cycle = 0.0467
End of teaser posts = 0.9
What would be the 90% if each teaser post represents 4.67% on average?
0.9/0.0467 =
19.27
16 teaser sets have been posted as of today.