Here I added some stats (from data.SE) on the site showing the increase in participation on the month of June, please add/edit some stats as you find it useful.
First, the number of bounties has obviously increased in June, 127 accounted (I think data.SE is not yet up-to-date with yesterday's new bounties though) compared to previous months' average 27 offered bounties. And the total of rewards amounts to over 7000 points (compared to previous months' average 1000 points)
Second, the number of answers increased by about 50%. After the average of 700-750 answers per month in 2016, June saw over 1100 posted answers.