Considering the value of fetchlands, especially Flooded Strand and its cycle from Onslaught, not likely happening. Death Baron is a faint possibility though Cemetery Reaper is currently the core set zombie lord of choice. Festering Goblin would be inferior to Fume Spitter . A Warchief cycle could be interesting, though something tells me the Krosan and Mistform Warchief s would be replaced by more conventional Elf and Merfolk Warchiefs. Carrion Feeder would be a good choice, especially for the current Standard. Unless Wizards decides to start printing multicolored cards and supporting enemy pairs in core sets, Stillmoon Cavalier is not likely.
I think the allied-color fetchlands are due for reprinting eventually. But the synergy between the fetch- and shocklands is probably too much for Standard. Mana-bases would become insanely complicated. I don't think we can expect them until Return to Ravnica has rotated out.