I wish I would have took a pic, because your reaction is just about the same as my pops when I told him there was no bearings for the input shaft.
It is just drilled out so that the shaft of the trans just slides right in, it must be a tight fit to the hole though, because I was able to pull the trans out a half inch before it felt like it was out the hole and coming out the clutch plate splines.
EDIT: Here I cropped and zoomed in on this pic of before I pulled the DMF off, you can somewhat see how it is.
It's just a smooth drilled hole, no bearings, or seals. All they say to do is put a very light layer of bearing grease on the end of the splines for the shaft.