disappearing of global perlish variables

[gabriele renzi]

Hi gurus and nubys,

matz said more than once that the perlish global variables like
$/ or $: are going away in future releases.

I wonder if is there already a decision, what they will become?
I mean, it's easy to think that $DEFAULT_INPUT may become a class
variable of IO but what about $1..$n or $: ?

More, would it be possible to have some kind of backward compat via an
external module ?