After some testing and "trial-and-error" I finally have got it to work! I have also posted a guide how to do, you can find it here: http://www.automatiserar.se/ikea-lanserar-tradfri-smart-belysning-men-gar-den-att-styra-med-vera-plus/#more-6870
It´s written in Swedish, if some of you are non-swede, try google translate or ask me 
@twids Can you describe how you managed to pair it with the Vera Plus? I have the same setup as you and havent had any sucess getting them to talk to each other at all...
After some testing and "trial-and-error" I finally have got it to work! I have also posted a guide how to do, you can find it here: http://www.automatiserar.se/ikea-lanserar-tradfri-smart-belysning-men-gar-den-att-styra-med-vera-plus/#more-6870
It´s written in Swedish, if some of you are non-swede, try google translate or ask me
@twids Thanks for your response! I tried to add it the same way as you did with no luck. But I will give it a second shoot later today. Which FW version are you running on your Vera Plus? I have 1.7.2138.
@twids Can you describe how you managed to pair it with the Vera Plus? I have the same setup as you and havent had any sucess getting them to talk to each other at all...