I like the looks of the new dynamic lighting system (although there are some things that seem... weird), however it is lacking a useful feature of the old Infinity Engine games (E.g. Baldur's Gate).
In the old games FoW worked to ways. If there was an area you have never been to/have not seen, it was pitch black. However if there was an area that you had been to but you were not currently there it would just be dark and you could only see the background stuff (in Roll220, think of the map layer).
I think this is vital as it would let players still see the areas they have already been to, but not items, NPCs, or anything of the like. This would allow them to make plans with out needing me to re-describe everything (like if they knew the layout of the fort, just not the locations of NPCs, traps, and what not).