Recently, the Galaxy S8 and S8 + began to receive Android Oreo , also, according to the SamMobile resource, Samsung began creating firmware for the Galaxy S7 and some smartphones in 2016. And just yesterday, on the site of the American operator T-Mobile, there was information that the manufacturer will update and flagship devices in 2015.
The support page for smartphones Galaxy S6 , S6 Edge , S6 Edge + and Note 5 states that Oreo for these devices is already in development. There is also a message: "T-Mobile and the manufacturer agreed to continue to support the devices." While there is no official statement from Samsung, but let's hope that sooner or later, the company will announce this.