I think they'll keep going with the current idea of adding new "past" characters until the show just runs out of steam (which i'd guess will be 3 seasons). I just hope when they get cancelled they have enough of a warning to properly...
When did Walt have an opportunity to give the kid those berries? I have to admit that I didn't make the connection with the flower pot at the end of the episode and the berries; glad I follow this thread.