First view video for season 3 is @ https://www.youtube.com/watch?v=A9aLA0j1ZPM
It's expected to cover volumes 4 and 5 of the light novels. All translated light novels can be found at baka-tsuki.org .
There are also 2 torrents of season 2 dubbed in english making the rounds. The first one is highly compressed at just under 1G, It's info hash is B95F44306917F22FEE2F7413FE94554CE96C46F9
The other is full 1080p weighing in at 17.1G and it's info hash is 9778AB3F0B395401D2ED93BE70CDA6CB31F0E420
Just type either hash into google for a selection of sites to torrent from.