Per FootballScoop, Texas Tech and David Gibbs are attempting to finalize an agreement for Gibbs to be Texas Tech's next defensive coordinator:

Per source, Texas Tech and Houston defensive coordinator David Gibbs are attempting to finalize an agreement this morning for Gibbs to become defensive coordinator at Texas Tech.

I would imagine that this becomes final either today or tomorrow and we'll have continuing coverage as the events unfold.

UPDATE: FootballScoop has updated their Scoop page with full story:

Texas Tech is attempting to finalize an agreement with Houston defensive coordinator David Gibbs and Cougars defensive backs coach/recruiting coordinator Zac Spavital, FootballScoop has learned. Interim defensive coordinator Mike Smith would move to defensive line to accommodate for Gibbs. Per source, incoming head coach Tom Herman offered Gibbs a spot on his staff as a co-defensive coordinator but with no play-calling responsibilities. Gibbs recently completed his second season as Houston's defensive coordinator. The Cougars were among the nation's best defenses at forcing turnovers under Gibbs' direction, leading FBS in 2013 with 43 takeaways - the most by any team since 2011 - and ranking 10th this fall with 30.

Noted that Mike Smith would move to defensive line and Spavital would come along with Gibbs as well.