I have not heard the 5th (but then i have not read much recently on that front) but every where is say the 'iPod Touch' is coming September.
I am waiting simply because it will mean a cheap deal on a 5.5 gen. I cant see how a touch screen will really enhance things for me, in fact i find them annoying at times - although i am sure the wow factor will be great for people that have not had a touch screen device before. WiFi would be nice though.