Seen on test recently at the Velim test ring: TŽ 723 701-9. Judging from the locomotive's Vehicle Keeper Marking (CZ-TD), the loco is destined for Třinecké Železárny (TŽ). TŽ is a Czech steel producer from based in Třinec. An image of the locomotive on Flickr can be found here: link It is the first of its type as far as we know. Based on its looks, it could be the first HeavyShunter.
A video of the locomotive at Svitavy:
Update: the locomotive does not carry the type name HeavyShunter, but EffiShunter 500.