An interesting article has been published on HCL Support website, which contains an overview table of the new features in HCL Notes 12.For each feature it lists the type of client that is supported, minimum Notes version, minimum Domino version etc.
Each feature listed has a link to the topic in the product documentation that describes the feature.
Source: HCL Support
| NERAL FEATURES | Standard or Basic client | Minimum Notes version | Minimum Domino version | Minimum ODS level | Minimum template version |
| Domino Restyle enhancements (New in 12.0.2) | Standard | N/A | N/A | N/A | N/A |
| Workspace enhancements (New in 12.0.2) | Standard and Basic | 12.0.2 | N/A | N/A | N/A |
| Database encryption improvements (New in 12.0.2) | Standard and Basic | 12.0.2 | N/A | N/A | N/A |
| Embedded Sametime is updated to version 12.0.0. (New in 12.0.2) | Standard and Basic | 12.0.2 | N/A | N/A | N/A |
| Advanced Properties improvements (New in 12.0.2) | Standard | 12.0.2 | N/A | N/A | N/A |
| Support for 64-bit Notes Standard Client (New in 12.0.2) | Notes Standard, Designer, Admin | 12.0.2 | N/A | N/A | N/A |
| All NSF databases in the data folder are automatically upgraded to the latest default ODS version (New in 12.0.2) | Standard and Basic | 12.0.2 | N/A | N/A | N/A |
| Microsoft Edge support (New in 12.0.2) | Basic | 12.0.2 | N/A | N/A | 12.0.2 Pubnames |
| Performance improvements (New in 12.0.2) | Standard and Basic | 12.0.2 | N/A | N/A | N/A |
| Toolbar settings remembered when client closed (New in 12.0.1) | Standard | 12.0.1 | N/A | N/A | N/A |
| Quickly deselect all text in a view (New in 12.0.1) | Standard and Basic | 12.0.1 | N/A | N/A | N/A |
| Improved support for Chinese and Japanese fonts (New in 12.0.1) | Standard and Basic | 12.0.1 | N/A | N/A | N/A |
| Improved Advanced Properties window (New in 12.0.1) | Standard | 12.0.1 | N/A | N/A | N/A |
| Silent install for cascaded Multilingual User Interface (MUI) pack (New in 12.0.1) | Standard | 12.0.1 | N/A | N/A | N/A |
| Controlling client JVM settings (New in 12.0.1) | Standard | 12.0.1 | N/A | N/A | N/A |
| Improved HTML rendering (New in 12.0.1) | Standard and Basic | 12.0.1 | N/A | N/A | N/A |
| Workspace icon improvements (New in 12.0.1) | Standard | 12.0.1 | N/A | N/A | N/A |
| Search improvements | Standard | 12.0 | N/A | N/A | N/A |
| Visual improvements | Standard | 12.0 | N/A | N/A | mail12.ntf |
| Performance improvements | Standard and Basic | 12.0 | N/A | N/A | N/A |
| Copy formatting of selected text and apply to other text in a document | Standard and Basic | 12.0 | N/A | N/A | mail12.ntf |
| Right-click support on URL links | 12.0 | N/A | N/A | N/A | |
| Change text color in Workspace | Standard and Basic | 12.0 | N/A | N/A | N/A |
| Workspace navigator now collapses partially or completely | Standard and Basic | 12.0 | N/A | N/A | N/A |
| MAIL FEATURES | |||||
| Alternate From enhancements (New in 12.0.2) | Standard and Basic | 12.0.2 | N/A | N/A | 12.0.2 mail12.ntf, 12.0.2 Pubnames |
| Setting the default font as a policy (New in 12.0.2) | Standard and Basic | 12.0.2 | N/A | N/A | 12.0.2 mail12.ntf |
| Improved UI for email drafts (New in 12.0.1) | Standard | 12.0.1 | N/A | N/A | 12.0.1 mail12.ntf |
| Support for “Restore archived mail” and “Restore and delete archived mail” actions (New in 12.0.1) | Standard and Basic | 12.0.1 | N/A | N/A | 12.0.1 mail12.ntf |
| Improved Alternate From (New in 12.0.1) | Standard and Basic | 12.0.1 | N/A | N/A | 12.0.1 mail12.ntf |
| Ability to disable GroupByDate (New in 12.0.1) | Standard | 12.0.1 | N/A | N/A | N/A |
| Enable shared mail files to send mail using an internet address by default | Standard and Basic | 12.0 | N/A | N/A | mail12.ntf |
| Select an alternate From address in a shared mail file | Standard and Basic | 12.0 | N/A | N/A | mail12.ntf |
| Send mail from your user name, short name, or Internet address | Standard and Basic | 12.0 | N/A | N/A | mail12.ntf |
| Inbox settings enabled by default | Standard | 12.0 | N/A | N/A | mail12.ntf |
| Additional Import abilities | Standard | 11.0.1 | N/A | N/A | N/A |
| SwiftFile improvements | Standard and Basic | 11.0.1 | N/A | N/A | N/A |
| Ability to override default signatures | Standard | 12.0 | N/A | N/A | mail12.ntf |
| Improved HTML rendering | Standard and Basic | 12.0 | N/A | N/A | N/A |
| CALENDAR FEATURES | |||||
| Dynamic online meeting enhancements (New in 12.0.2) | Standard | 12.0.2 | N/A | N/A | 12.0.2 mail12.ntf |
| Free Busy time lookup for Microsoft Exchange users (New in 12.0.2) | Domino | 12.0.2 | 12.0.2 | N/A | 12.0.2 Pubnames |
| Reduced clutter in calendar (New in 12.0.1) | Standard | 12.0.1 | N/A | N/A | 12.0.1 mail12.ntf |
| Online meeting integration (New in 12.0.1) | Standard | 12.0.1 | N/A | N/A | 12.0.1 mail12.ntf |
| Invite other users to meetings created by an external mail user, such as Outlook. | Standard and Basic | 12.0 | N/A | N/A | mail12.ntf |
| Improved rendering of Microsoft Teams invitations | Standard and Basic | 12.0 | N/A | N/A | N/A |
| Improved Calendar interface | Standard | 12.0 | N/A | N/A | mail12.ntf |