Odd. I didn't change either map for this version. I think.Seems like the easy map starts you in creative mode with NEI cheat mode enabled. Hard map seems fine. Easy map has something weird with the sun disappearing after a few seconds after starting the map and the sky seems to grow smoky or overcast.
Edit...
Did some checking it seems the smoky or overcast sky with no sun is the new "rain" so instead of raining it just becomes overcast and slightly darker I assume this is the drought mod?
And yes, what you are seeing is rain. Basically, the map is acting like you are in a desert.