The four missing ones are coming "Very Soon".
Maro's Tumblr wrote:
bunsenburn asked:
Why is there six new pathways, as opposed to the usual cycle of 5 dual lands? Why are they a mix of ally and enemy? Will we see the missing four in another set later this year? As a player who plays a deck not in those colors, it is annoying to be left out from this powerful dual cycle, especially when I can't just say "oh my deck is ally colored and these are enemy colored".
The other four are coming very soon. : )