Not really. I was looking at these today (only interesting car on the forecourt) as my folks were looking at an Avensis.
In my opinion - a great looking, and decent specced car, but I wouldn't change my ED30 for one. I do like the fact these are RWD & have a boxer engine, so will be a great drive. Pearlescent white looked lovely...
They're £21-£26k for one at the mo, and I guess - being so new they're at the top of their depreciation curve. If you won't worry about the money - go for it, and have fun!
ED30 prices seem to be sliding abit, so if yours isn't super low mileage, you could always buy another for less in future if turns out the GT86 isn't for you...?