A small firmware update to the last update was released for the E-M1, and E-M5 mkII cameras. It adds some enhancements to how the image stabilization works. It also fixed a flash bug when using internal remote flash control on the E-M1. This firmware update DOES NOT reset the camera. (THANK GOODNESS!) So I would definitely update.
I have updated the resource pages on my site to reflect this and detail out what has been updated. I have links to show you how to update firmware there as well.
You can also read more about the update on Olympus’ page.