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Honestly speaking this happens a lot as this is one of the cheapest way to get your website ready! -          Email them and ask them to at least remove your GA code from the headers so that you can stay in peace. Most of the times, people give a damn so give it a try and see what happens. -          DMCA takedown notice to their host server! This should be the right way but not sure how much time will it take. -          Get the New GA code and move on! Quick and easy way out. Hope this helps!

Hi Chris, I like your approach. Although this is outside the scope of your question, another thing I do is use Google Webmaster Tools landing page report to see what keywords are driving traffic to my pages. In truth, with so much advanced semantic analysis that Google is doing these days, once you move beyond targeting a single keyword, the math gets really hard - really fast! So for now, it's the old one keyword at a time approach. Thanks for the question and keep up the good work.

Hi Chris, First thing is I'd look at the Wayback machine and make sure you followed the same URL structure of the old site and look for any oddities. Does the site have an old Google Webmaster Tools account? You might want to poke around in there and make sure there aren't any old URL removal requests or anything else that could potentially cause problems with the relaunch. if you don't have a GWT account, be sure to set one up. Quite honestly, if these articles existed before, I don't see any advantage to releasing them slowly vs all at once. In fact I'd prefer all at once especially if articles linked to one another. Finally, I'd make sure there were no penalty issues on the old site, and address them if there were. You don't want to bring any of those back to life in the process

The more content that ends up ranking for it's own topical focus, the better the whole site does - it all gets a lift.  The critical key though is topical relationships. If the content becomes too diverse across a site, it can weaken the site's topical consistency.  The exception to this concept is if the site is intended to be a "general information" site covering a vast range of topics.  However even in that case, when a site gets too diverse, it becomes increasingly more difficult to get individual topics to rank because only so much time and energy can go into supporting any individual topic.

Normally if two pages have similar content, you can use canonical tag to tell Google about your preferred page. But if you want to keep them both without using canonical then Google will randomly decide on of the 2 similar page. Similar content is an issue for sure. though recently Google's algo has become complex and it can recognize type of the site like it seems to be OK for many eCommerce sites to have similar content. But if you can reduce the percentage from 50 % to bit lower, it will be better I guess.

Sunita is right on this one. There's more benefits from getting likes to a variety of pages rather than the homepage.