I tried installing latest (snapshot) OH2 with Nikobus binding on rpi2:
- had previously working OH 1.8.2 (with Nikobus binding)
- downloaded OH2 snapshot and extracted to /opt/openhab2
- copied items and sitemap from OH1 to corresponding folders within the OH2
- copied nikobus binding from addons OH1 folder to OH2
- copied openhab.cfg and installed feature:install openhab-runtime-compat1x - as described here
- installed feature:install openhab-transport-serial
Using basic UI I was able to turn on/off lights, dim lights, use window shutters… so in short, it seems to work, at least during my short test…
Hope I included all the steps above, was writing from my head, but the bottom point is that it seems to work.
I will do some more testing and let you know if there are any issues and if I have time, I might create a PR (if someone else won’t do that first 
).
Thanks all for doing a great job.