This guy has created a real life jetpack that he hopes to use to cross the English Channel. When I saw it, my first thought was that this must be sort of similar to what Wren looks like in PSIII.
More about him and his attempt to cross the Channel here:
http://www.jet-man.com/prod/index_en.html
http://technology.timesonline.co.uk/tol ... 821359.ece