I found that duo ARTA GT300 Shinichi Takagi & Takashi Kobayashi also raced at Super Taikyu with Direction Racing this year.(
http://www.ksfrontier.com/super_taikyu.php)
And previously Direction Racing at Super GT planned to use 2 Huracan at 2016 season, so if ARTA doesn't have a car to compete at next season probably the duo ARTA GT300 can drive the second Huracan for next year (alongside current Direction Racing's lineup)
Well, this is only my analysis. I haven't got any further details.
Based on the duo ARTA GT300 performance, I don't think they're deserved to take sabbatical because unable to find a team...