Learning Perl 6th Edition available

Why can't I upgrade my digital edition? Not that books are that expensive but if the original is work $20 why is the same thing with a few minor changes still $20?

Great that they removed the preface from the example chapters. Now, you can't find out what has changed in this edition. I saw a reference to StackOverflow in the introduction that I guess wasn't there in the previous version. But apart from that I have no clue if I should get it ...

... Perl 6... available!!!!!!

<3 I owe so much to Learning Perl

I got a little excited when I though "Lama book for perl 6!", then I was a more than a little disappointed.<p>How is this any different than the previous 5 editions? And if not, why should anybody care there is a new version? And how is this hacker newsworthy?