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Hi Megan! Any word on when this will be released?

It is correct that DA, PA, depth of pages, etc. are all factors in determining which pages get indexed. If your site offers good navigation, reasonable backlinks, anchor text, etc then you can get close to all pages indexed even on a very large site. Your site map should naturally include a date on every link which indicates when content was added or changed. Even if you submit a 10k list of links, Google can evaluate the dates on each link and determine which content has been added or modified since your site was last crawled.

Hi Tim, There is a new version of OSE in the works currently, though I'm not sure if that feature will be in there.  I know that the web app is set to have some for of historial tracking so stay tuned.  You can also submit feature requests here: http://www.seomoz.org/dp/change-log