Barnes & Noble's has comes up with the latest v1.4 firmware for your nook but it will make you lose all of your root access from previous firmware. However, nookDevs have a great solution with v1.4 firmware that already been hacked so you don't have to worry about losing your Android enjoyment such as VPN support, third-party application support and root access. It also let you runs the latest official v1.4 firmware function.
The latest v1.4 firmware hacked will runs on both the 3G version and the newer one. It has softRoot, nookLibrary, Trook, nookLauncher, nookWiFiLocker, VNC and busybox preloaded, and has capability to runs the ereader as if it's a dual-display Android tablet. How amazing is that?