There's also rumours that Legends of Tomorrow, if it returns, may be stripped down as apparently it's production cost is too high.
Rumours that Supergirl may either not be renewed or moved to another company, possibly CW, are floating around as it's costing FOX $3 mill per episode. While it's been generally positively received, they're not sure it's worth hanging onto. Hopefully it gets moved to CW, but if they're planning on axing or stripping down Legends because of it's production costs, I don't see this as very likely right now. Hopefully I'm wrong as both shows are good. Supergirl would, of course, fit in better on the CW anyway.