During an event at the MF Bunko J Summer School Festival 2017 Re: Zero kara Hajimeru Isekai Seikatsu announced that they will be releasing a new OVA. Outside of that, not much else is known about the OVA. Their promo trailer for the OVA is below but since yo boy doesn’t speak fluent Japanese I can’t and won’t pretend like I even know what’s going on. I’d honestly just recommend you watch the video anyway and make an educated guess on what’s happening. As a fan of the series, I’ll more than likely give this OVA a try even if later we find out there is little to no action scenes involved.