Do chromosomes uncoil in interphase II?
In many cases the chromosomes do undergo some dispersion, they do not reach the extremely extended state of the interphase nucleus, this all happens in telophase -I. It would be correct to refer to the stage between two meiotic divisions as interkinesis which is generally short lived.  

The prophase-II is initiated immediately after cytokinesis, usually before the chromosomes have fully elongated.