Hotwire doesn't specify, but I believe the 4-day PLUS has 1 "plus" option. The others (5,6,7) day are presumably the same as those offered through Disney:
5 day = 2 pluses
6 day = 3 pluses
7 day = 4 pluses
Good luck trying to get an answer out of Hotwire. I tried emails & phone calls trying to verify that info. Their cust service people know less about the tickets than my 6 y.o. They dont even know what a plus is. All they do to attempt to answer your question is read the information that is on the website that I had already read. I ended up cancelling with them.
We ordered 4 days PHP from Hotwire and they had 1 plus option. We received our tickets in 4 days also. We saved about $22 ordering through Hotwire, and we were also able to order our Q&C Meal Vouchers and Vacation Kingdom Lunch certificates through them.