This was spotted at the 2015 National Hardware Show.  It is a handle that goes on the end of a garden hose.  It amplifies the normally 40-75 PSI pressure to 100, 200 or 300 psi.  This will give a significant boost and it also can siphon water , no hose needed.  That is the coolest feature.  It makes it the baddest water gun on the block!

Before you go getting all excited this is not available yet.  It will hit the shelves in January 2016 just when its -20 here in Chicago.