We have just today completed rework to the Notifications tutorial using the 10.3.1 product release and are copy editing the tutorial now. There are some changes to screenshots illustrating how to configure the outbound connectors for notifications, but the existing Notifications tutorial (10.2.x) should be sufficient to help you design e-mail notifications. We should have an updated Notifications tutorial uploaded this week or early next week.
The notifications tutorial covers how to design GeoEvent Services to generate SMTP e-mail notification, SMS Text notification (which also relies on SMTP), as well as XMPP Instant Message. You should not expect to find help on how to configure an e-mail notification output, for example, in the product introduction tutorial. Some topics have to be split out to different tutorials as we work to manage the scope the product introduction tutorial - by far our largest tutorial. A 10.3 revision for the product introduction tutorial was released early February 2015.
The product team works to update the tutorials as quickly as we can get to them. Many of the 10.3 connectors (Twitter, Instagram, etc.) had not been uploaded simply because their tutorial had not been updated so we didn't consider the offering complete. We've recently adjusted our release criteria and at least upload compiled *.jar files on the Gallery even if a revised tutorial is not available.
If we have to release a connector without a tutorial, you'll find a README in the bundle you download indicating that content and exercises in the previous version's documentation should provide sufficient information to get started using the upgraded component ... just be aware minor differences could exist between the content, exercise steps, and screenshots as you are going through it.
Tutorials are available on the ArcGIS GeoEvent Gallery. If the content provided by an earlier release of a tutorial does not answer questions you have, please e-mail the GeoEvent Team at geoevent@esri.com and let us know. Please include GeoEvent Tutorial Feedback in the subject of your e-mail. This will help us determine which tutorials are the most important to the user community at large.