See
here for an overview of the new features in TA.
I can flop at strategy and tactics without help, but at this point even playing at all is mostly guesswork
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The game itself is still mostly the same, the bulk of the non-graphics change in TA being the tech trees and adjustments to the effectiveness of improvements (as has been done many times in past patches). Aside from that, the existing DL/DA manual is still pretty accurate about the basics; if you've played the game before, then you should be able to pick right up with TA.
The economy was made more challenging in TA, but again, short of a new tutorial there's not much a manual would do to help with that.
different names for different races while trading (like Artificial Gravity/Gravity Manipulation) and lack of description for techs not in your tree.
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You can see the description and effects of any tech in the diplomacy screen by simply right clicking on it.