I have in my hand a The New England Journal of Medicine paper from Friday, March 4 that just came out. It's pretty hot off the presses. The conclusion says that, “Despite mild clinical symptoms, ZIKV infection during pregnancy appears to be associated with grave outcomes, including fetal death, placental insufficiency, fetal growth restriction, and CNS injury.” In fact they found that 29% of the Zika-positive women had fetal abnormalities as revealed by ultrasonography and there were none in the control group. It seems to me that there's starting to be some compelling evidence in there.
On March 7th, 2016. See this statement in context.