got an answer from the team :
We are working on the plugin compatibility with SketchUp 2013 right now and hope to be releasing very soon- but as we are not yet in testing phase I'm afraid I can't be specific about a date. You´ll receive notification from us when it is released though.
I hope this helps but if you have any other queries please don't hesitate to let me know.
Kind regards,
Kyrstie Wade
Next Limit Technologies