I don't know what it does if you don't have the SDK (I don't have it yet, and it doesn't seem to be doing anything)... but you can enable Developer Mode by typing the following into universal search at the launcher (where you see your wallpaper and/or the cards)...
Yes... if you read that carefully, that's
which is... the Konami code, of NES fame.
Palm rocks 😄
Engadget posted it about 12:30am.
It was found because of the Palm Pre OS Rom Image was leaked:
Leaked heck, it was published in the ROM restore tool. Not sure if they meant to do that, but it was right there.