Floss will not fit between new crown. Will this go away with time?

You should definitely be able to floss between the crown and adjacent teeth.  If not, call and have your dentist take a look.  There may be a piece of cement that needs to be removed.  It should not be difficult to correct.  

This is something we see often.  You should definitely be able to floss between the crown and adjacent teeth. If not, call and have your dentist take a look. There may be a piece of cement that needs to be removed. It should not be difficult to correct and should only take a few minutes.

There are two reasons this is happening.  Either there is excess cement between the crown and the adjacent tooth, or the contact is very tight.  Both have an easy solution.  You will need to go back to your dentist and have them see what the issue is.  Your dentist will either remove the excess cement or loosen the contact.