Whatever the ECB comes up with is likely to pale in comparison to developments in Tokyo earlier, where the Bank of Japan announced a massive expansion of its non-standard efforts to increase the amount of money in the economy.
Moreover, these incentives do not just expand or contract the economy by the amount of any tax cut or tax increase, as a Keynesian stimulus purports to do.
They propose an infrastructure program to promote the economy, but finance it with a tax increase that removes at least an equal amount of aggregate demand.