Android L is undoubtedly going to be released by Google before the end of this year, and as more time passes you might be inclined to ask yourself when or if your particular device will get updated. With Samsung's Galaxy S5 and Note 4, it's clearly not a matter of 'if', as they will both surely receive the new OS version. But when?
Here comes the first rumor on the matter. Apparently you should expect rollouts to commence either in late November or in early December. That would be pretty fast for Samsung, even if Google pushes out the new bits tomorrow.
However, there's no release date for Android L to speak of right now. But it looks like Samsung may be working towards having updates ready sooner than usual. This may of course have something to do with the recent moves by some of Samsung's competitors. Last year, HTC and Motorola were both reasonably fast with updates to Android 4.4 KitKat (Motorola far more than HTC).
And this time around Moto's already said that it will have updates ready within 90 days after it gets the finalized source code from Google. As more and more companies finally realize how important timely software updates are for smartphone owners, Samsung probably has no choice but to work faster too.
That said, it's pretty clear that the Galaxy S5 and Note 4 will be the first Samsung devices to see Android L. When older handsets such as last year's Galaxy S4 and Note 3 may get updated is a different matter entirely, and we wouldn't be surprised if that only happens next year.