New Apostolic Reform (NAR) and does it affect mainstream Christianity (US and worldwide)

I just listened a local podcast (in Finnish) about NAR movement and how it impacts on mainstream Christianity in US.

Podcaster and interviewed researchers discussed about possible impacts on how we interpret Bible in future and does doctrines change drastically if we accept that some people will have "Apostolic" mandate in future.

Does someone have deeper understanding of NAR movement, is it already mainstream in US or worldwide, what nominations are close to it (for example Pensacola Pentecostals was mentioned) and does it clash with traditional and fundamental Christian principles, doctrines and traditions?

I'm looking this outside US and have hard time to find good source about what is happening in US and how these movements have impact on us non-US Christians.