Objects. The semi-announcement that they'll put Cor in the Core is a good thing (as long as Cor actually delivers on its promises)

Actually, getting Cor into the core now that backward compatibility is going to be broken, IMO, doesn't make too much sense.

Moose creator, Stevan Little, pursued for a long time the idea of adding a powerful, modern and feature rich native OO framework to Perl, IIRC, he went into creating several prototypes, but time after time he hit the backward compatibility issue an at the end he throw in the towel (BTW, I recommend revisiting its Perl is not Dead, it is a Dead End talk as it is quite relevant to this discussion).

Ovid, who is a very clever but also practical guy, instead of persuading the perfect, but unrealisable OO system took a different view: could we get something that is useful, simple, cover most use cases and could be implemented without pervasive internal changes or breaking backward compatibility? And he come to Cor, which IMO is very good given the constraints, but definitively not state of the art.

So, in summary, we are getting the no-so-good solution now that the rule that had been making the really-good-ones infeasible is going to be lifted!