There's a leaked Android 4.3 Jelly Bean ROM out in the wild this morning, in the form of a pre-release build for the 'Google Play edition' Galaxy S4. It's also been ported to the European LTE Galaxy S4 (GT-i9505) in the form of a custom ROM, courtesy of the original source of the leak, Samsung fansite SamMobile.
We've fired up that ROM on our European GS4 and shot a quick hands-on video, giving an early glimpse of the next version of Android. And, well, it looks an awful lot like the current version of Android, supporting earlier reports that 4.3's changes are mostly under-the-hood, rather than user-facing. That means for the most part, we're dealing with the same user experience found on the current Google Play edition GS4.
Update: In terms of under-the-hood changes, we're seeing android.hardware.bluetooth_le listed as a feature in the Android System Info app, suggesting Bluetooth Low Energy support is on-board in Android 4.3, as previously reported. (This feature isn't listed on our Google edition GS4 review unit running Android 4.2.2). Similarly, Bluetooth tethering is present in the 4.3 ROM, while it's absent on our 4.2.2-based GS4 GE review unit. And we're seeing new developer options in the 4.3 ROM.