It was only going to be the "new graphic", but now it has extra functionality too, the main elements being multiple lightmixes, AB comparison even if images are different sizes or aspect ratios, better management of history, Gain / Gamma / Lift tone mapping. EDIT oh yes and leave bloom and glare to only be calculated at the end of the render, not repeatedly during rendering; plus drag and drop a CXR into the VFB and edit it immediately without a "one pass render to make it active" which reduces reliance on the CIE (and means you can edit any CXR even if the original scene is not what you have loaded).
PS - and there more to come in 13, e.g. reworking the denoising workflow, and more, as now we have QT to build upon after this rewrite, which opens up new possibilities.