I'm a Canadian who was denied a tryout with the Spanish junior team...even though I'm a Spanish citizen.
I have to say, I was quite miffed by the politics involved with the lower level countries' associations and national teams. These countries have plenty of good players with citizenship in North America, and I know of quite a few in a similar position to myself.
We extend ourselves to try and play for our national teams, and we know we're good enough to play D2 or lower, and get denied by the associations.
Very frustrating, but Spain has to still be one of the favorites from D2B, not only as the hosts but because they have a lot of returning players from last year's team which held their own in D2A. Korea and China are the other teams to watch in D2B this year.