I was looking forward to this feature too, but when 5.14 was released the docs had this to say e.g. from push:
in reply to Re: Consistency, syntax, and little minds
in thread Consistency, syntax, and little minds
Starting with Perl 5.14, push can take a scalar EXPR, which must hold a reference to an unblessed array. The argument will be dereferenced automatically. This aspect of push is considered highly experimental. The exact behaviour may change in a future version of Perl.
... which has discouraged me from using it :(