I've been waiting for this announcement ever since Generation V. Better late than never, they say.
Ruby and Sapphire are the only games I haven't played so this will be a new experience for me.
Half the charm of Pokemon remakes comes from those familiar areas and characters you're allowed to rediscover. Take that away, and you're taking away half of the satisfaction they provide. If you want a new experience, there's still time to play through Ruby or Sapphire before Alpha and Omega are released. It'll make the return to Hoenn that much more worthwhile.