"Xevious" for Atari 5200?

Is it true that Atari had plans on its drawing board during 1983 to release Xevious for its 5200 Super System, but ultimately dropped it because of declining 5200 sales and the impending video game crash that took hold at the end of that year?

I'm also wondering if they planned to program a port of said game for the ColecoVision?

~Ben