Current list:
<!-- res/values/strings_help.xml -->
<string name="help_hint_message_list_pull_select">Swipe down the left side to select several messages at once.</string>
<string name="help_hint_message_list_settings">See settings, Message List to customize.</string>
<string name="help_new_close">Take me to AquaMail</string>
<string name="help_new_new_look">New look</string>
<string name="help_new_enable_material_design">Enable new theme (Material Design)</string>
<string name="help_new_enable_floating_button">Enable Floating Action Button</string>
<string name="help_new_see_settings">You can change these later in app settings under Look and feel. The old themes are still there, too.</string>
<string name="help_new_new_features">New features</string>
<string name="help_new_gmail_oauth">• More secure, Google recommended, authentication for Gmail and Google Apps accounts (OAUTH2).</string>
<string name="help_new_android_wear">• Enhanced notifications for Android Wear smart watches.</string>
<!-- res/values/strings_prefs.xml -->
<string name="prefs_ui_floating_action_button_always_enabled_summary">Always enabled when using the new theme on Android 5.0</string>
<string name="prefs_view_list_color_aux">Color: message times and sizes</string>
<string name="prefs_compose_buttons_top_not_available_summary">Always on when using the new theme on Android 5.0</string>
The meaning of "help_new_xx" items is explained here:
http://www.aqua-mail.com/forum/index.php?topic=3046.0