In other slightly more official news, Universal has filed a permit with the City of Orlando for the "Construction of Halloween Horror Nights 2015 houses". Unlike in the past, where they've filed an individual permit for each house, it looks like they've opted to include them all in one master permit this year. It's possible the City will require them to split it into individual permits as it goes through the review process, but as of now, speculation aside, it looks like we're still in the dark as to the actual number of houses. However, with this permit appearing almost a month before any HHN permits from previous years, it's looking very likely we'll see more houses than ever.
http://edviwr.cityoforlando.net/OrlandoWebPermits/permitting/login.aspx?CaseNumber=BLD2015-03663