Theres no bonus so I guess that the market finds a natural equilibrium in price between the two different chains and you exchange them manually as I'm not certain if the ability to burn BLK for the BLN coin lasts forever or not actually.
I wonder this too actually, will the bonus just end after the 14th and will there still be the possibility to burn or will this be the final chance to burn BlackCoin for BlackNet?
OP states:
IBO started at 07 Sep 2018 00:00:00 UTC and will end at 14 Dec 2018 00:00:00 UTC
the 0% bonus already in effect:
07 Dec - 14 Dec 0%
last chance to burn until 14 Dec 2018 00:00:00 UTC