The Active and All Textures thumbnail views are still available in the command tree if the user wishes to use them instead of or as well as the Resources viewer.
The image below shows the tooltip with information about the texture that the mouse is over.
When editing a layout, clicking on "Active Textures" in any of the shader nodes will open a window that contains the textures being used by that shader. Clicking on "All Textures" in any of the shader nodes will open a window that contains all of the currently bound textures. This includes the textures that are not being used by the current shader.
Each thumbnail image has a title at the top that indicates the shader type that the texture is bound to (VS, HS, DS, GS, PS, CS), and the texture index (e.g. PS(3)). Below the image are basic details about the image. These include the texture type, size, the number of mipmap levels, usage flags, format, and the number of samples.
The image below shows the difference between "All Textures" and "Active Textures". In this case a single texture is bound to the pixel shader but the shader does not actually use the texture. Therefore, it shows up in the All Textures view but not the Active Texture view.