Google is trying to make it easier on the way advertisers do remarketing on Adwords. They have created a remarketing list that you can apply to URLs of your page instead of needing to create tags one by one. Both choices are now different options to select from. Another change is for marketers who have Google Analytics account linked. There will be a beta release to allow these remarketing lists to be created within GA.
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AdWords Remarketing Gets Tag Makeover, New Features