All the docks that I have seen so far that are available now or promised to be released in the future that take advantage of the docking port on the side of the Nexus 7 all hold the tablet in a landscape position. The problem I see with that is that many of the launchers have a harder time in landscape mode. Plus I do a lot of reading on my tablet which I find easier in Portrait mode as well. All of the docks that I have seen that hold the tablet in a portrait position are really only charging stands and do not utilize the docking port on the Nexus 7.
Has anyone seen....or heard of a dock still yet to be released....that uses the docking port on the Nexus 7 and holds it in a portrait position?