GigaOm confirmed the news with Samsung following a report on Clove.
Yes, if you buy an unlocked Note 3 in Europe and travel to, say, the U.S., you will not be able to use a local SIM card. The same applies the other way round. In other words, you will be forced to pay for your carrier’s outrageous roaming fees or go Wi-Fi-only.
This is more than a little ridiculous; hopefully other device manufacturers won't follow suit.