As a side question - Does the new Roles in perl6 cover the delegation-pattern ?

Yes, although not as extensively as Class::Delegation. You can see examples of it here. In addition Moose also supports Perl 6-ish style delgation like so:

package Tail;
use Moose;

sub wag { ... }

package Dog;
use Moose;

has tail => (
    is => 'ro',
    isa => 'Tail',
    default => sub { Tail->new },
    handles => { 'wag_tail' => 'wag' }
);

## later in your code ...

my $fido = Dog->new;
$fido->wag_tail; # is equivalent too $fido->tail->wag;
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Its seems to me that the main difference between Perl 6/Moose style delegation and Class::Delegation is the options for combining methods that Class::Delegation offers.