Played with this some in draw. Ok for reasonably simple drawings (some limitations like rounded corners on lines dont work). Not ready for complex Visio drawings (gets pretty overwhelmed pretty quickly....does not do a real good job with transparency....etc)
It almost looks like that import scans some but not all of the visio shapesheet cells and has some problems with complex formulas in the shapesheet cells.
While applaud the effort (the sole reason I upgraded to 3.5), I suspect it might be a doomed approach since its going to be tough to handle all the flexibility/power/precision of visio. Personally, I would think it would be better to enhance draw natively to support the features -heck just make 3D/ISO/projection work right would be a big step forward- or.....figure out how draw could launch visio in context (or sketchup for that matter).