According to Yemeni sources, the Houthi are reported to have suffered significant casualties, including the loss of several high rank commanders, during renewed combat against the Yemeni Army in Marib and Shabwah.
It would seem the official government, whether on their own initiative or with the backing and cooperation of the US, are taking advantage of the disruption being caused by the UK and US air operations.
It remains to be seen if the Saudi armed forces also take advantage of the situation.