In order to improve consistency within the jQuery UI suite, select/selected will be renamed to activate/active across the board. What this means for tabs is that the selected option will be renamed to active, the select event will be renamed to beforeactivate, and the show event will be renamed to activate. The beforeactivate and activate options will include references to the tab and content panel for the old and new tabs, similar to accordion. In addition, the select method will be removed in favor of the setting the active option. Lastly, the deselectable option will be removed in 1.9 since it was deprecated in 1.8.
Related to #7135, #7136, #7138