I can't say for certain but it will depend on whether you want to have animated characters to some extent. There are converters between most of the common formats and I
hope will support conversion from ".x", ".3ds", ".obj" at least.
I will try to get further information from Lee as I believe he's working on 3D...
EDIT: Lee's answer...
Quote: "
Hi Steve,
We are currently using OBJ as a no frills basic loader, but the plan is to support our own proprietary format to keep the engine lightweight and solid. We will then produce a compile side converter/exporter to move popular formats into our own format. For day one compatibility though I suggest they look at OBJ format.
Best Regards,
Lee.
"

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