I wouldn't be surprised if these changes were real. The krayt dragon actually sounds horribly produced though.
There wasn't anything wrong with the first version of the yell in the first place. Obi-Wan simply screamed outloud with a strange yell to scare off the sandpeople. What the hell is a krayt dragon anyway?
A krayt dragon is EU bullshit that's been designed to explain every single little detail possible in the Star Wars movie imaginable. Every. Single. Creature in the movies has his own Wookiepedia page and likely a trilogy of novels dedicated to him.
Want to know what the guy's deal at the bar was who harassed Luke? He's got more of a backstory the Princess Leia and a legion of fans dedicated to him.
So when Lucas first laid that skeleton there he had no plan for it, no idea what it was and thought no further on it. Forty years later here we are with an entire expanded story on that skeleton's species and I'd bet that particular skeleton's owner has entire stories centered around just it to show how it ended up there.
The EU is a mess of shit seeking to explain exactly where every piece of subatomic matter in the Star Wars universe came from, where it is going and why.
So, hey, because of all of that why not make Obi Wan's call more "krayt dragony" instead of just a generic "animal call" to scare off the Sand People (all of whom each have their own six-novel series dedicated to every waking moment of their life up to that moment and to the point where they go back to their hut and draw pictures of the dragon in the sand).
Who knew Obi-Wan was the Michael Winslow of the Star Wars universe?
I think the next edition of the movies should be The Star Wars Saga: Wilhelm Scream Edition. Every single scream, yell and yelp in the six movies is replaced with the infamous Wilhelm Scream Georgie boy is so fond of.
I sense much anger in you.
Yes! Yes! Let the hate flow through you...(insert Palpatine cackle here).