There've been stations in Etobicoke since last year along the Martin Goodman.
They can keep expanding outward, but at some point the built form and lack of cycling infrastructure will result in increasingly diminished returns. I might put some along the Humber River trail, but they would probably see more benefit by focusing on infill for the next round. We'll see how much is yet to come this year, but there could definitely still be more stations throughout the east end and midtown, as well as in the Junction. And it doesn't always come through in the maps, but there are probably lots of sensible infill sites throughout the city.