If you've not really got involved up till now and aren't feeling the urge to do so, I'd guess even Stardock would urge you to wait till release (and the day 0 patch!).
Throughout the process, they've been very clear that it's not the final product which is available for pre-order beta testing and the section i quoted above goes further to demonstrate that what is finaly released will be different even to beta 4.
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