Google has announced the next version of its Android mobile operating system at the Big G’s annual developer conference, I/O 2017, Android O is the title. The "O" means Oreo and it will be version 8.0. Oreo is the nickname of the new Android OS. Android 8.0 Oreo will be the next and the senior version of Android 7.0 Nougat.
Google Confirms Android O As Android 8.0: Check The Release Date & Phones.. Android-oreo

Android O is coming with new power and performance optimizations and many new ways to extend your apps.

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Android 8.0 Oreo will be rolling out beginning from early to mid-August this year, it's expected to be released via OTA updates to some Android devices.

Google Confirms Android O As Android 8.0: Check The Release Date & Phones.. Android_O

Pixel users (Phone by Google) will definitely be the first to receive it. If you have been a devoted follower of Android OS, you’ll discover that Android Nougat 7.0 was released Over-The-Air in August 2016, and now this…

Android O is coming straight to some phones which is already listed below.

1. Google Pixel, Pixel XL — Being Google's own devices, the two Pixels are ought to begin receiving Android O as soon as it's officially out. 

2. Nexus 6P, Nexus 5X — Google's former flagship phones will likely begin receiving Android O after the Pixels, but should be running it well before the year ends.

3. Samsung
Galaxy S8, Galaxy S8+: No info yet, but may likely receive Android OTA update in February 2018
Galaxy Note 8: May likely come with Android 0 out of the box… worst scenarios, Jan – Feb’18
Galaxy S7 & S7 Edge: Between March to April 2018
Galaxy S6, Galaxy S6 Edge, Galaxy S6 Edge+: Spring time of 2018

4. Nokia
HMD promised that Nokia 3, 5 & 6 will be getting Android 0, but there are not projected time for it.

5. LG
LG V30, LG G6, LG V20 and LG G5: hearsay suggested that this version of LG may likely get Android 0 early 2018.

For other brands, no information yet about them in regards to this. Only time will tell when smartphones from Infinix, Tecno, Gionee, Innjoo and even iTel will get this update.

Watch out for the OTA updates of Android 8.0 Oreo on your Android devices. If your Android phone is among the eligible devices, you should see the update starting from next month.