Not a breakthrough talk, but a nice summary of the last 8 years of research demonstrating the existing known epigenetic effects on the unborn fetus of maternal diet during gestation using both animal and human study examples. The talk was given by Prof Mark Hanson.
His concluding remarks included:
In animalsthere is proof of principle of benefit of dietary interventions during pregnancy
(suprisingly not yet for humans)
Epigenetic markers measurable in early life may be useful biomarkers of later risk, and possible indicators of efficacy of intervention
We have to educate families who come to our clinics.

The talk also provided a useful reference to an article summarizing epigenetic mechanisms by SK Zaidi 2010