There are rumors.  Matthew Cantarino at First Things observes:

But an event like this, if it does indeed occur, would represent such a poetic, almost-unbelievable Medieval occurrence that it is bound to seem, to many of us in the first world, like some sort of political ploy or cynical biographical touch. Yet even if political motives figure in Castro’s decision (which they no doubt do to some extent), that should not necessarily not take away from the enormity of the event. A political leader’s conversion, especially one whose entire governmental philosophy has at its core atheistic materialism, has to be scrutinized for the public effect it will have. In Castro’s case, it is difficult to conceive how the effect would be anything but an enormous positive for Cuba’s repressed Christian community.

I hope it is true. If so, we’ll know it’s for real not when Castro goes through the sacramental motions, but when he opens the gulag doors and sets his political prisoners free.