Deutsche Telekom and NetCologne have tested it. Adtran thinks they will be able to ship soon, but NetCologne doesn't expect much until next year. Broadcom's Greg Fischer confirms to me, "We entered production with 212 MHz G.Fast devices last quarter and also released production standards compliant iDTA. We’re working with standards groups to assure same with cDTA."
212 MHz should deliver as much as a gig up to about 200 meters.