The scene has actually been around for quite a while. The Pandora has born on the GP32X forums, which themselves were formed around the Gamepark GP32, circa 2004. As more handhelds came out of Korea (GP2X F100, F200, and more recently the Wiz and Caanoo) the community continued to grow around them.
The Pandora was first conceived on the GP32X forums in 2007. As Kodeln said, the community is now based at both forums (the official ones here and the community ones at GP32X). In terms of software development and release news, there is more activity at GP32X.
It's now a touch over two years since preordering, and with the complete first batch still not delivered, we're all still here
Alongside all the new faces are software devs and gamers who have been around since the GP32 days. Individuals have come and gone but the community has persisted, and without it, the project probably would have failed already. I have no doubt that the scene will continue to get stronger as production goes on.
Regarding the time it has taken, Caine summed it up nicely.
Delays can and do happen, so keep that in mind if you decide to order.