Hi stucki,
the redwood forest will be a separate pack. They involve a lot more work and
we’re planning to include some nice far landscape mountains and stuff.
But more details about it will come clearer when we start on in a few weeks.
I think the winter pack is a nice discount 
You know the price is already quite low for the quality you get.
There is a lot of knowledge and work that goes into creating these packs.
Making them even cheap would mean it’s not worth for us doing them at all.
About wind, not right now. Since these are not speedtrees it’s a bit more complicated to hook them up.
I guess you could write something in blueprint that reads the wind direction, intensity and speed,
feed that into a material parameter collection and use these values to drive the ones inside our materials.
Maybe something we will investigate more when we have some spare time and add it with a later update if it performs well.
Or Epic finally adds the wind actor into the materials functions!? 
But we have all those material wind values exposed so you can tweak them via the material instances.
cheers
Willi Hammes
Managing Director
MAWI United GmbH