ArcGIS 10.1 includes additional and improved functionality throughout the ArcGIS product line. Several product name changes have changed at 10.1. The Maplex for ArcGIS extension functionality has been moved into the core ArcGIS for Desktop product and is referred to as the Maplex Label Engine. The following list summarizes new functionality for labeling, annotation, and the Maplex Label Engine: A new toolbox is available - Geodatabase Administration - that contains some tools that were previously in the Database toolbox (Upgrade Geodatabase, Upgrade Spatial Reference, Change Privileges, Compress, Migrate Storage, and Register With Geodatabase) plus the following new geodatabase tools: At ArcGIS 10.1, you can program your own buttons and tools using Python add-ins. Python toolboxes are a new kind of toolbox you can create with Python. ArcGIS for Server has been rearchitected at 10.1 to work in 64-bit architectures and use a more cloud-friendly, web services-oriented design. Amazon Machine Images (AMI) that can be used to deploy ArcGIS for Server on Amazon Elastic Compute Cloud (EC2) are now available with the following operating systems and database management systems: for the Linux computing platform in addition to Windows. The new ArcGIS for Server architecture allows better support for cache creation and geoprocessing on Amazon EC2. There is also a new application—ArcGIS Server Cloud Builder on Amazon Web Services—to deploy your ArcGIS Server on Amazon Web Services site, create templates, make backups of your sites, or delete sites. ArcGIS smartphone applications and software development kits (SDKs), are on shorter release cycles than ArcGIS, but the following mobile products all have new functionality available in the ArcGIS 10.1 timeframe: At ArcGIS 10.1, the Data Interoperability extension has been updated to run on the new FME 2012 spatial data transformation platform by Safe Software. In addition to new transformers and increased support for lidar, the extension is now installed with the following independent setups: There are two new dockable windows available for the ArcGIS Tracking Analyst extension in the ArcGIS 10.1 release: Also, there are two new geoprocessing tools available for the ArcGIS Tracking Analyst extension in the ArcGIS 10.1 release: The Maplex for ArcGIS extension functionality has been moved into the core ArcGIS for Desktop product and is referred to as the Maplex Label Engine. At 10.1, renewing or upgrading your license has been simplified and improvements have been made in License Server Administrator. ArcGIS for Desktop, ArcGIS Engine, and License Manager now allow you to upgrade older versions of licenses or renew expired licenses on your machine without having to reauthorize your software. For ArcGIS for Desktop, once the software is installed, you are prompted to upgrade or renew licenses when ArcGIS Administrator is launched. For ArcGIS Engine, licenses can be renewed by launching ArcGIS Administrator, opening the Support Operations folder, then clicking Renew or Upgrade, which launches Authorization Wizard. Authorization Wizard then checks Esri Customer Service for upgradable or renewable licenses and guides you through the process. License Server Administrator now displays transferred and checked out licenses in addition to borrowed licenses in the Availability window. For ArcGIS for Desktop and ArcGIS Engine Concurrent Use and Single Use licenses, you can now choose which licenses to deauthorize instead of deauthorizing all licenses by default. At ArcGIS 10.1, if you pause your pointer over a control in a toolbar or a menu item, you now see longer, more descriptive ToolTips rather than the single line ToolTips you saw previously. Some of these ToolTips contain a link to the installed ArcGIS for Desktop Help so you can access more information. These ToolTips replace the pop-up context sensitive help that was previously accessed through the What's This help tool in the Standard toolbar. That tool has been removed at 10.1 and the context sensitive help has been retired. ArcObjects developers can specify these new style ToolTips for controls they create, and include links in the ToolTips either to CHM files or web pages. Source.