If you are part of the Android Beta Program and are set to receive updates via OTA to the Android N developer preview, then you will have probably already heard that the second developer preview is now rolling out. If it has yet to land on your device as an OTA, then you can always manually flash the factory images. However, if you would prefer to wait until the OTA does roll out then you will likely see it land in the coming hours or so.
Either way, if you are wondering what is new, then Google has already announced the big changes which should be expected including the likes of adding support for the Vulkan API and also some redesigned people emoji. However, they are not the only changes available and there will be a ton of smaller tweaks including as well. One of which will be very handy to a number of Nexus owners. This is the inclusion of a 'clear all' button on the recent apps list. In the first developer preview, as well as any other version of stock Android, clearing opened tabs was an issue and had to be done manually and one at a time. However, that is not the case now with the Developer Preview 2 adopting the trait of many skinned versions of Android and including a communal clear all button.
Another change which is on the cards with the latest update is the way in which folders now look and appear. The change is not exactly a drastic one, but is still a change and is one worth noting. Basically, while folders still appear as folders and are still circle, they do not adopt the old way of lining app icons up behind each other. Instead, they now seem to show four apps all in micro view within the larger circle. So while not anything special, it is still a nice visual change which will make it easier to identify icons within folders. You can see an example of the old and new looks side by side in the image below. Not to mention, you can expect to be hearing about a number of other changes coming through as well in due course.