Is there somewhere a list of features or new additions?
Not a definitive one...Chris went MIA before he completed a readme. After using it extensively, I'll try and list the features I know about, and Diggis can maybe explain about the batch and GMAX integration. Also, the setup is much improved, but that's already documented. This is all off the top of my head atm.
LOD Utilities. A series of tools to help with LOD creation, such as the ability to select an object or multiple objects and make a skin-tight LOD...excellent for water models.
LOD export tools that will send the LOD files to a .3ds file (named as the .max file) then will auto-launch BAT. You still have to import the LOD files
Lighting
Added support for different lighting rigs (included) that can be selected via pulldown menu. Includes a fix for MR Sun/sky that prevents ever darkening scenes.
Support for Trunite, 2 pass and 3 pass night rendering. Mental ray fully supported up to Max 2008.
PreviewsProper day & night previews based on LOD size, as you would get in BAT/GMAX. Also added the ability to preview in persective mode, either day or night. This will activate nightlights, including nightlibraries. Invaluable for testing nightlighting
Under the HoodNot sure exactly what's been done, but I know the gamma issue has been corrected and a lot of the "dead wood" has been removed. Also there is no need for the deltree any more...the script will automatically clear outputfiles.
Batch export
A method where Max scenes are set up in a queue that match to a rendered output queue in BAT. This allows multiple scenes to be rendered in one go, including FSH conversion. As mentioned, Diggis has tested this part and is better placed to explain it better than me.
There are loads of other new nifty features that I cannot remember off-hand how they work (such as templates)....I suggest you download, install and have a look-see.