Yeah, waterproof does not meen fool proof!
I am sure they will have instructions on how to dry and maintain the emaxx if you run it in water. I hate getting my rc vehicles wet or muddy just because I can't stand cleaning them. I hate nitro for that reason too, sticky, dirty mess! Nice to know that the electronics won't crap out if they get spalshed, I have accidentally gone in a few ditches before
I do like the increased chassis space, nice of them to move the tranny forward and turn it around too. This will make going brushless even easier. The center driveshafts look very strong, and hopefully the diffs will hold up too. I would like to convert one and try to keep it as light as possible, worked with my xtra light pede, I never break anything on that truck.
I am sure that we will see a vxl4-5 setup with a l-xl sized motor in the near future. If those battery trays can handle 8 cell packs then it should be good for 5s! 4s lipo and 14 cells are about the same, so we know it will be good for 4s, and traxxas always allow for bigger batteries to be put in, so 5s is not a stretch, it would be nice if the esc could handle 6s though.
On a side note, the new villian boat with the evx2 can apparently handle 14 cells too. I almost bought one, but do not like the plastic hull, I have other brushless boats and they have fiberglass hulls, which are alot better.