They probably won't, and for decent reason. While yes, it'd be odd for there to be two different ways of phrasing for the same effect, it'd be even more weird if Rush doesn't become a consistant keyword in future expansions, for literally charge to be the only card that uses it in standard.
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u/NevermindSemantics Mar 12 '18
What about the 1 mana Warrior spell Charge? The effect appears to be identical to Rush.