Well, this is partially my impatience (so lock if you wish), because I won't be able to download/try out the invisible tile today...
I was wondering if you could use it then to solve the problem of a named unit "getting a horse"? Like you could have a trigger where when your named unit enters area a, he gets removed (or invisibled?) and the horse named unit who was invisible on the other side gets revealed. Is this possible?