1. Search the “Relationship” field in People. You get better results by using Phonetic name. Put “Wife” as “Spouse” in Relationship gets no hits. “Wife” as Phonetic name get an exact match.
2. It does not search your phone, well at least from 1 Oct 13 onwards. What ever stuff you store, type, annotate, music, podcasts will not turn up in a Google Now search. Even if you want to it can’t I think the only storage area it searches is Drive and Evernote.
3. Since it does not recognize music stored on your Phone, Play and Listen don’t work any more.