TF2 source 2 totally makes sense as although TF2 gets no updates, it's still a popular game and valve can't totally take the idea of upgrading it to source 2 off the table themselves.

This one is a shame that I don't really understand, I wonder if it's related to the fact that it's for the GameCube and that's Nintendo's territory. I'm curious to see if this activity continues and expands, as even on steam there are remakes of half life in source and basically fan expansions to portal being sold for profit, among other products and projects.