Hi Moriturimax, well for the initial v4 beta release the main new things are that it's now a 64-bit program so it can use all the available memory on your machine and the Mac version is now a native compiled version and doesn't use Wineskin anymore which fixes a lot of various problems on the Mac.

That may not sound like much but it has taken a really big effort and a lot of rewriting of MoI's internals to make that happen.

Now that the beta process will be starting and the low level rewrite is complete, I'll be working on adding brand new features soon. I won't know specifically which features will be in the final v4 release until it's done though. But some areas that are likely targets are instancing and grouping as discussed in this thread. It's difficult to make a specific prediction because sometimes a particular thing may end up being significantly more difficult than initially anticipated.

- Michael