If New Frontier was adapted into a TV series or movie, and changes were made from the source material (eg setting the Excalibur missions many years after TNG, since Patrick Stewart would be much older that Picard was in NF #1, which was set in 2373, if they wanted to have a Picard cameo, etc.), what would be considered "canon"... the filmed material, or the books they were based upon? It's like when the Harry Potter films change some elements from the novels ... which details are considered canon? I know the "rule" is that filmed Trek is the only canon material, but what about if a whole concept was based on a Trek book series?