This is truly excellent news! I've just signed to a petition on the EU PS official forum to pressure Sony to notice our interest in getting the prepaid cards for EU. And here it is! The rumor at least!
I am quite confident that we're going to see the EU PSN prepaid cards, as the article says, it makes perfect sense that Sony will release it since PSP Go relies very heavily on the prepaid PSN card, since Sony must be aware of the severe limitations on EU PSN buyers, most of whom would rather pay with a store-bought prepaid card than apply for, or use their credit card, which can quite tricky sometimes, as the billing address must exactly match what you type in, or the transaction is simply invalidated by the PSN store security.