Well, when I look at the Hexus and Tweaktown articles I notice differences in the fronts of the showed N3200's. The one on Tweaktown indeed looks plastic, the one on Hexus looks nice and more pro in my opinion.
I'm doubting a lot buying a N5200 Pro (little bit to much, but nice for trying things out) and waiting for a N3200. The question is if there also will be a lot of nice modules created by users for the last mentioned. And that's a real selling point!
In my opinion it has a old fashion style looks, I like it. For me I won't need the N5200 Pro in my home, N3200 is perfect with Raid 5 now I can use 75% HDD capacity instead of 50% as Raid 1 for other 4 Bay NAS out there.