That theory have reached a great evidence support, the current investigations have focused in the regulatory and functional networks of the genes implies in the dorsoventrla axis determination. For that reason i think there's little recent theoretical additions.

The hot topic related to the dorsoventral inversion theory in the evo-devo is the evolution and the number of origin events of the nervous system... I think these papers show this research tendency:

http://link.springer.com/article/10.1007/s13127-011-0044-4

http://www.nature.com/nrn/journal/v10/n10/abs/nrn2703.html

http://onlinelibrary.wiley.com/doi/10.1111/j.1525-142X.2010.00460.x/abstract;jsessionid=4B7D2F58D4FC0BAC520DE090C40A5E44.f02t01?deniedAccessCustomisedMessage=&userIsAuthenticated=false

http://www.biomedcentral.com/content/pdf/2041-9139-4-27.pdf