It seems that Google are wasting no time in getting the development kit for the latest version of Android into the hands of developers.
Less than a month after Android 4.1 was announced at Google I/O, the new SDK allows developers to optimize their applications with a wide variety of new features.
Among the things Google have warned developers to look out for is taking care when optimizing a particular application to work with the larger 7 inch screen size, such as the one found on the Nexus 7.
The Google devs also urge application developers to start taking advantage of the new richer notification styles introduced in JB, as well hardware accelerated rendering to take advantage of the new framerate optimizations.
For more info on developing for Android 4.1, check out Android Developers. Meanwhile, the new SDK can be downloaded from here.