According to a post at zyxelforum.de, new USG model will be ready in 2014. They'll be running with UTM software V4.x based on a new hardware platform. The new VPN models most likely won't get UTM functionality in the future. A reason for this might by limited (flash) memory.
Source:
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www.zyxelforum.de/neue-v ··· l#p31542