Here is a good collection of Power Point presentations (Slide Decks) on various features of SharePoint 2013:
1. Introduction to SharePoint 2013: This presentation describes the SharePoint 2013 from high level and describes the various new features in new SharePoint.
Download it from: http://download.microsoft.com/download/7/7/3/773CA2C2-579B-408C-808E-A6F561194E20/Ig15_SP_IT_M01V1_introduction.pptx
2. Requirements for SharePoint 2013: This presentation describes the Hardware and Software requirements for SharePoint 2013. This also covers the browser support for new version of SharePoint along with set-up and deployment considerations.
Download it from: http://download.microsoft.com/download/7/7/3/773CA2C2-579B-408C-808E-A6F561194E20/Ig15_SP_IT_M02V1_requirements.pptx
3. Request Management in SharePoint 2013: This presentation describes the Request Management feature in SharePoint 2013. Request Management feature allows to control the incoming requests to SharePoint and route it to the appropriate servers.
Download it from: http://download.microsoft.com/download/7/7/3/773CA2C2-579B-408C-808E-A6F561194E20/Ig15_SP_IT_M03V1_requestmgmt.pptx
4. Analytics Platform in SharePoint 2013: The Analytics Platform replaces the Web Analytics service application in SharePoint 2013. The presentation describes the new Analytics service in details.
Download it from: http://download.microsoft.com/download/7/7/3/773CA2C2-579B-408C-808E-A6F561194E20/Ig15_SP_IT_M03V2_analytics.pptx
6. Alternative Service Mapping and Self Service Site Creation: The self service site creation has been updated in SharePoint 2013. The following decks describes these changes along the changes in the Alternate Access Mapping.
14. App Management Service Application: SharePoint 2013 has introduced the apps model. As part of that a new Service Applicaiton has been introduced which manages all the apps installed in the farm. This service is accessed every time there is any interaction with the apps.
Download it from:
http://download.microsoft.com/download/7/7/3/773CA2C2-579B-408C-808E-A6F561194E20/Ig15_SP_IT_M06V03_appmgmt.pptx15. Business Connectivity Service in SharePoint 2013: Significant changes have been introduced in the BCS Service. This service now provides alerts for the external lists. External list have been enhanced for performance improvements, Data Source Filtering, Sorting & now allow Export to Excel. Read more in the presentation.
16. Excel Service in SharePoint 2013: Read more about the changes done in the Excel Services.
17. User Profile Service in SharePoint 2013: User Profile Services has been worked to improve the performance. Changes are described in the deck.
18. Machine Translation Service in SharePoint 2013: A new service has been introduced in SP2013 to provide built-in translation capabilities on the SharePoint platform. This service utilize the cloud based translation services.
19. Performance Point Service in SharePoint 2013: Learn about the changes in the Performance Point Services in SharePoint 2013.
20. Visio Services in SharePoint 2013: Learn about the changes in the Visio Services in SharePoint 2013.
21. Work Management Service in SharePoint 2013: A new service is introduced in SP2013 which helps to consolidates tasks for a user from multiple various applications and display them in Sharepoint. These various apps can be Project Server, Exchange Server other SharePoint Farms etc. This service does not have any configuration option from Central Administration.