Sony this morning unveiled its new Reader Daily Edition, which it says will feature 3G wireless connectivity from AT&T. The device, which is devoted to the Sony eBook Store, features a 7-inch touchscreen and will sell for $399, according to a live TechCrunch blog.

The new device from Sony follows in the footsteps of the two digital readers the company released in early August, Reader Pocket Edition and the Reader Touch Edition.

The Pocket Edition sports a five-inch electronic paper display, can store about 350 standard eBooks and provides up to two weeks of reading on a single battery charge.

The Reader Touch Edition features a six-inch touch screen panel, allows users to take handwritten notes with the stylus pen or type with the virtual keyboard, offers expansion slots for both Memory Stick and SD cards and retails for about $299.

While both the Touch and the Pocket Edition received high praise for the hardware in early reviews, many critics were unhappy with the lack of wireless connectivity on the devices.

The Reader Daily Edition will be available in December.