the way i see it, is that some maps are ment for wii users and others for pc. so, the wii started with a bunch of maps and so far these can only be unlocked via the tiki-code thingy. the newsletter map appears on th pc, but not on the wii...if i got that right. this should not be a problem for wii users, since the prize is the same as the one you could already get by using the tiki from map #6. also, the avatar prize from map #2 is the same as the prize from map #3 and since map 2 is unlocked by completing map 1 and the website sends this info to your game, which i assume is not working for the wii, this is probably pc only as well.
so, in conclusion:
1, 2 and 7 are PC maps and
1, 3, 4, 5 and 6 are wii maps.
in the end the pc user will have the same prizes as the wii users and also there will be a double set of rewards with the exception of the wallpapers, since this is the starting map for both systems. that is probably why telltale is totally fine with people playing with the tiki codes, since it doesn't steal y anything from them and you could probably not play the wii maps on pc anyway.
the wii user should be able to get all their prizes already, but pc users still need to find some maps.
there will probably be new maps for the further episodes.
Corn is no place for a mighty warrior!