Nothing concrete, but he did state that the team is working on various devices with multiple aspect ratios and sizes. (windowscentral.com)
Cinematographer Roger Deakins (billed as Roger A. Deakins) shot the film at a resolution of 3.4 K using the ARRI Alexa XT, eschewing the more apt Alexa 65 because it offered him greater flexibility in choosing lenses and preparing the feature for exhibition in multiple aspect ratios. (filmfreakcentral.net)
For successfully employing multiple aspect ratios, cast comprised mostly of non-actors, documentary feel and extended takes, a film like Krisha would deserve acclaim for its technical aspects alone. (nextprojection.com)