So basically there is no source or confirmation yet.
Some one sourced Pete Hines on twitter but I looked through alot of the tweets and couldnt find one that said that perks continue past 50
Let's work backwards instead. We've been told you get a perk each level. The ONLY thing we've been told about 50+ is that leveling slows down. Why would you NOT get perks past 50?
Actually thats not true, at one point in time they said that perks would stop at the soft cap of 50, this is why people are confused
You would think by now someone with the guide would have confirmed the number of perks