Contact Form 7 4.2 will be released at the end of this month. The edit screen has been overhauled for better usability. Add-on plugin authors should test their plugins to Contact Form 7 4.2 Beta early.
There are significant changes in the user interface of the edit screen: it no longer uses WordPress’s meta-box UI for its editing sections; instead, it uses the tabs interface that jQuery-UI provides. If your add-on plugin controls Contact Form 7’s edit screen, you need to pay particular attention to the changes.
As a result of the changes, the following filters and actions were removed from Contact Form 7 4.2:
wpcf7_cf7com_linkswpcf7_add_meta_boxeswpcf7_admin_after_general_settingswpcf7_admin_after_formwpcf7_admin_after_mailwpcf7_admin_after_mail_2wpcf7_admin_after_messageswpcf7_admin_after_additional_settings
If your add-on plugin uses those filters and actions to add your own content to the edit screen, consider using the new wpcf7_editor_panels filter as a substitute.