It has an AMD A6 APU from what I can tell. That's not an ARM chip so it'll be full Windows. Mystery solved.
Wait there's an All-In-One with the same name as this upcoming tablet. Did someone get a name wrong somewhere?
Amazon.com: Samsung ATIV One 5 Style All-In-One Desktop (21.5-Inch, White): Computers & Accessories
Apparently it's called the Samsung ATIV One 5 Style... can you get any more confusing?