Disney recently announced more changes to Genie+ - they simply can't stop tinkering with it! The journey to this point has been a long one, so I won't recap all of it but some of the "highlights" include Genie+ not being available for pre-purchase, variable pricing by date and the ability to modify your reservation (that last one at least is a positive).
The variable pricing was probably the biggest sea change, as originally it came out as one fixed price. Now the pricing is based on Disney's expected crowd level, meaning that the busier and more crowded the parks are, the more Genie+ would cost you. Disney has pushed the envelope with the pricing, maxing out (so far) at $35 per person during this past Easter season.