America's PSPgo early adoption deal is Rock Band Unplugged demo
Americans that take the plunge with a new PSPgo handset are to be given a free Rock Band Unplugged demo along with the hardware, according to this Kotaku piece.
Which is great. If it wasn't for the fact that Europeans get a free copy of GT PSP.
The US offer's a bit more than a standard demo, thankfully. It comes with five songs and it compatible with any tracks you buy from the PS Store.
But still.