Currently the unity stack is failing with a large number of test failures per-machine (last run returned 33 test failures). Most of the failures are related to preview tests. This is blocking the release of unity, as we're way over our acceptable threshold.
Link to one of the failing machines [1]
Full list of failing tests from recent run:
unity.tests.test_panel.PanelWindowButtonsTests.test_window_buttons_show_when_indicator_active_and_mouse_over_panel(Single Monitor)
unity.tests.test_dash.PreviewClickCancelTests.test_middle_click_on_preview_icon_cancel_preview
unity.tests.test_switcher.SwitcherWindowsManagementTests.test_switcher_rises_other_application(show_desktop_icon_false)
unity.tests.test_panel.PanelWindowButtonsTests.test_window_buttons_unmaximize_button_works_for_window(Single Monitor)
unity.tests.test_hud.HudVisualTests.test_switch_hud_dash_does_not_break_the_focused_application_emblem(Single Monitor,Launcher autohide,Launcher on primary monitor)
unity.tests.test_dash.PreviewClickCancelTests.test_right_click_on_preview_text_cancel_preview
unity.tests.test_dash.PreviewClickCancelTests.test_left_click_on_preview_icon_cancel_preview
unity.tests.test_dash.PreviewClickCancelTests.test_middle_click_on_preview_info_hint_cancel_preview
unity.tests.test_dash.PreviewClickCancelTests.test_left_click_on_preview_text_cancel_preview
unity.tests.test_showdesktop.ShowDesktopTests.test_showdesktop_unhides_apps
unity.tests.test_panel.PanelWindowButtonsTests.test_window_buttons_show_when_holding_show_menu_key(Single Monitor)
unity.tests.test_dash.PreviewClickCancelTests.test_middle_click_on_preview_text_cancel_preview
unity.tests.test_dash.PreviewInvocationTests.test_app_scope_preview_open_close
unity.tests.test_dash.PreviewNavigateTests.test_overlay_text
unity.tests.test_panel.PanelKeyNavigationTests.test_panel_indicators_key_navigation_prev_works(Single Monitor)
unity.tests.test_panel.PanelKeyNavigationTests.test_panel_menu_accelerators_work(Single Monitor)
unity.tests.test_dash.PreviewClickCancelTests.test_left_click_on_preview_ratings_widget_cancel_preview
unity.tests.test_dash.PreviewClickCancelTests.test_right_click_on_preview_image_cancel_preview
unity.tests.test_dash.PreviewClickCancelTests.test_right_click_on_preview_ratings_widget_cancel_preview
unity.tests.test_panel.PanelTitleTests.test_panel_title_on_empty_desktop(Single Monitor)
unity.tests.test_dash.PreviewClickCancelTests.test_middle_click_on_preview_image_cancel_preview
unity.tests.test_dash.PreviewClickCancelTests.test_right_click_on_preview_info_hint_cancel_preview
unity.tests.test_dash.PreviewClickCancelTests.test_left_click_on_preview_image_cancel_preview
unity.tests.test_dash.DashRevealWithSpreadTests.test_dash_closes_on_spread
unity.tests.test_panel.PanelKeyNavigationTests.test_mouse_does_not_break_key_navigation(Single Monitor)
unity.tests.test_dash.PreviewNavigateTests.test_navigate_right
unity.tests.test_panel.PanelMenuTests.test_menus_shows_when_new_application_is_opened(Single Monitor)
unity.tests.test_panel.PanelIndicatorEntryTests.test_indicator_opens_when_dash_is_open(Single Monitor)
unity.tests.test_dash.DashClipboardTests.test_ctrl_a
unity.tests.launcher.test_scroll.LauncherScrollTests.test_autoscrolling_from_top(Single Monitor)
unity.tests.test_switcher.SwitcherWindowsManagementTests.test_switcher_raises_only_last_focused_window(show_desktop_icon_true)
unity.tests.launcher.test_tooltips.LauncherTooltipTests.test_launcher_tooltip_disabling(Single Monitor)
unity.tests.test_dash.DashClipboardTests.test_ctrl_x_v
[1] https://jenkins.qa.ubuntu.com/job/autopilot-saucy-daily_release/484/label=autopilot-intel/
Given the dates, the fix for this was released in Unity 7.1.0