I can only say that I made a trip to HQ last month and was VERY excited with what I saw in this arena, having both lead and plastic offerings on the horizon. They told me they were planning for a fall release since the crew was (and perhaps still is) in the design/testing phase for these products.
If there is any consolation to this not being a summer release (at least for me), it is the fact the the Big Muddy is living up to its name and there is little productivity with this style of fishing as of late. However, I do feel for you all of you that have good water conditions and would like to employ these in your summer patterns... the good news is that Do-it is progressing towards a custom line-up to help us all with our hover strolling game.