Outlander (and the Lord John spinoff) is one of my favourite series. I have to say I was less than impressed by the first book but the series really improves quickly. I like multi-POV series so I'm glad it started taking off in that direction. I'm looking forward to the next book but I don't think a release date has been mentioned anywhere.
I had to giggle at the comment about 20th century characters - time-travel is involved, so they may *be* 20th century characters!