More of the same, of course!
http://www.fallout3nexus.com/downloads/file.php?id=2672, fresh out of beta, extending its de-greening to water pools, indoor lighting and indoor fogging, lighting templates and, of course, doing the weather you all know so well even better than before.
If you're used to Fellout 1.0.16, here's what's new:
No glowing green pools of fog/water.
Less green smoke/fog indoors.
No more of the occasional crazy-looking weathers that 1.0.16 became (in)famous for.
Fewer sky white-outs and a console workaround for them.
No dirty records, Fellout can go pretty much anywhere in the load order and work (but please put it fairly low for the best experience).
Nights should hardly ever go completely black.
Fellout has been tested with FOOK and FOOK2 and is fully compatible. I don't use FWE or any of the other large overhauls, but Fellout should work just fine with them as they're quite happy to let me handle what's in the sky while they handle what's in your hands.