1)FAT16 is not supported anymore!!!
2)Fat32 support
3)sdhc supports
4)saves auto backup
5)new menu interface
http://krikzz.com/pub/support/index.php?dir=ms-everdrive/os-bin/Completelly new OS core, sources of old os was not used at all.
Few months ago i started work over unified OS, which will be used for SMS, GB/GBC, and may be for some other carts. At this moment unified OS supports SMS/GG and EDMD-V3. SMS version is a first published build of this OS. EDMD-V3 version is not published at the moment, but it looks completely like original edmd-v3 OS and have identical functions, but may be with some "bug features" in addition (:
New unified OS is very optimised in terms of memory usage, it allow increase file per folder limit. SMS-ED now can handle up to 512 files per folder, genesis version can handle few thousands of files per folder