Any plans to get plugin to WP 4.0 Compatibility?

The Duplicate Post plugin is compatible with 4.0, jose.

Please mark this as resolved.

An aside:

If you’re having issue, and you’re also using Time.ly’s All-In-One Event Calendar, it is the culprit. Time.ly, despite having paying users, won’t fix it, though (see here if interested in that).

You can find the solution to the issue here: http://wordpress.org/support/topic/clone-and-new-post-not-working/#post-6518664