This was a fairly unexpected announcement from Tesla on Friday, although we did have prior warning. BIPV has always presented a challenge of matching the efficiencies and costs of regular PV modules. BIPV will never be able to compete fully on these grounds with modules but they certainly do have a market. The aesthetics of solar tiles have always been a little underwhelming but these new Tesla PV tiles certainly look the part. What I really want to know now is some data on outputs and efficiencies. More information required Mr Musk!
Building-integrated photovoltaics have traditionally suffered from costing more and operating less efficiently than conventional PV. Elon did not deem it relevant to mention the efficiency of SolarCity's product or how much it costs. Presumably those are things a customer might want to know. Elon checked one box of his stated goal -- the shingles do look better than a typical roof. The rest of the claims are still up in the air.