The Next2 may be the "next" ebook reader produced by Nextbook, but it is Android 1.5 based, and not with RTOS Embedded Adobe DRM Reader Mobile v9. The two are very dissimilar!
The Next3 looks more powerful and relevant as it is Android 2.1 based.
The Next2 and Next3 can be consider "tablets" whereas the Next1 is a dedicated ebook reader (but
wants to be a
PMP with that Prestigio PER3072B firmware v2.1.3).