Dynamic address assignment in IPv6 using DHCPv6

Hi Ranchers,
I would like to assign the IPv6 address via DHCP. I tried the last Release (v0.8.1) but I found no way to get it up and running. RancherOS always prefers a stateless address configuration and is not requesting an ip address.

Is there any permanent solution to change to default behavior from SLAAC to DHCP?

Cheers,
Philipp

BTW: CoreOS is addressing this issue by assigning both, a stateful and a stateless ip.