According to the official website, an OVA of Rinne no Lagrange was announced. The title is "Rinne no Lagrange: Kamogawa Days" and will be previewed at theaters from June 23rd. Rinne no Lagrange Season 2 will start in July.
Could be more slice of life or could be fan service with daily lives till the big shit comes to start S2. Either way fan service is awaited but BAD NEWS the BDs don't have any details added it so I hope for some sexy BlankVs and BlankBs angles.