DG just posted the preliminary TA which is awaiting approval by the
EASA (European FAA):

http://www.dg-flugzeugbau.de/Data/tn-359-24.pdf

DG also added some more FAQs at the bottom of the web page dealing
with the main spar issue:

http://www.dg-flugzeugbau.de/holm-dg300-e.html

Markus