I think (going on the screens for the unlicensed club teams) that the actual jersey design and colour should be the practically exactly the same as the real life counterpart, you'll just have an alternative emblem/crest on the jersey and no sponsor featured...
apart from that there should not be any real difference in the jersey... '04 just put a rough idea of a jersey if a team was unlicensed, this time round it is near spot on
Not a chance. No licence whatsoever of the World Cup.
Also, there are only a handful of International Teams with authentic kits: All 6 Nations, All Tri-Nations, Argentina, USA, Canada . . . and I believe that's it. The others are like what Raz said: proper colors, and designs, but not the logos/emblems/sponsors etc.