They are waiting for the Family Suites at All Star Music to be open for a while before they restart construction. This way they can see what they should build. About a year of data should give them what they need, and IIRC the rooms were finished about the end of May last year.
The rooms (in PC:LY) are getting to the point where they are needed, especially during the busier times.
I would expect construction to restart by the end of the year. I don't know if they will have an announcement as to 'we are going to finish PC' but they may.
The only intangible that is in the works is how much resort construction Disney wants going on at once.
You have both AKL DVC and Contemp DVC being worked on, AKL DVC first obviously. I don't know if Disney would want to have construction of three resorts going on at around the same time, especially if you consider the Western Beltway Property as well.