While just yesterday we saw reports of the Android v4.3 update coming to Samsung flagship devices very soon, we have new reports which seem to confirm them.
According to a leaked road map of a French carrier SFR, both the Samsung Galaxy S4 and the HTC One would receive the latest Android v4.3 update in October. This will be followed by the Android v4.3 update being pushed to the Samsung Galaxy S3 and the Samsung Galaxy Note II. While the HTC One updates would be pushed Over the Air (OTA), above mentioned Samsung devices could use the Samsung Kies to download the updates.
The road map shows that the Samsung Galaxy S3 and the Samsung Galaxy Note II would receive the Android v4.3 updates in November or December, which matches the earlier reports of updates before the end of the year. In the meanwhile, the Nokia Lumia 520 would also receive the GDR 2 in this October.