The Texas Republican’s appeal has prompted a series of Supreme Court briefs from all of the parties involved in the Texas redistricting litigation. The SCOTUS briefs can be seen here: Davis/Veasey, Latino Task Force, DOJ and all other intervenors.
The Supreme Court will decide whether or not to take up the Texas case in early January. It is possible that rather than formally consider the Texas appeal they simply set it aside while the Court reviews other related challenges, like a pending case in Alabama challenging provisions of the US Voting Rights Act. Regardless, any action by the Supreme Court short of rejecting the Texas GOP appeal outright will lead to delay and uncertainty through much of next year.