I have an '08 Retro 7.5 m2, but I have not had the chance to test it against the '07 7.5 Glide.
My guess would be that the Glide will have a little more low end (deeper draft throughout the entire sail) but the new Retro 7.5 will be faster on the top end, give
a little better stability overall, and have a greater tuning range.
I've been working on ships pretty much non-stop lately, so I'm behind quite a bit on my
'08 testing. I hope to spend more time on the water next week prior to the Windfest in Hatteras at Frisco Woods 4/17-4/19 2008.
I will have new '08 Retros in 8.5/7.5/6.5/5.5 m2 sizes (plus some new Revo's and a full set of Huckers) at Windfest so come on out and try them.
Hope this helps,