Welcome to the patchnotes for the 3720 patch.
This patch is a combination of small fine-tuning and changes to game mechanics. It's a relatively small patch stabilising the balance and getting things out of the way so that the focus can (hopefully) be shifted towards SCUs going forward.
Selen, Jester and Bombers are all getting small buffs as a follow-up to previous patch. Mantis icon is changed from a LAB icon to a tank icon as this became an apparent issue with the resurgence of LAB usage after their buff. Shard will now actually hit stuff. Mex build time and build power are reverted to pre-engymod values, making them more efficient to assist and making the choice between using engineers for reclaim and assist more meaningful. Target priorities have been fine-tuned from the last change. Overcharge now kills a mobile shield generator if it depletes its shield.
We wish you good luck and much fun playing with the new patch!
-- The Balance Team"
For what's it's worth there is enough written here so that we can more or less get our heads around why the changes happened.
And for more we can just go and pester Turin on discord I guess.