From the press release: "Lightroom 4.1 RC2 now includes the ability to process HDR TIFF files. (16, 24 or 32-bit TIFF files) This can be quite useful if you have merged multiple exposures into a single 32-bit image using Photoshop’s HDR Pro. Using the new basic panel controls can be a very effective and straightforward method of achieving an overall balance across the tonal range."

This means you cannot only import HDR files (TIFF and DNG formats) into Lightroom but also perform quite good tone-mapping.