There's no trailer yet as Slitherine plan to properly announce and show more of it on their next live stream on April 10th. From the early shots I'm seeing on the Steam page it's graphics aren't exactly mind blowing but are promising and hopefully the developers will up the coloured lighting and effects like some of the above games have to polish it's appearance it's in the future.
Modest budget indie HoMM like games seem to be all the craze these days with games like Songs of Conquest, Silence of the Siren, Songs of Silence, and the officially licensed Heroes of Might & Magic Olden Era, so it's pretty cool to have yet another one on the way!
Steam: https://store.steampowered.com/app/2134 ... rmbinders/
Screenshots:




Teaser (will replace with trailer once there is one):