As far as answering the question of future hope for Israel, the Chronicler has in the genealogies (ch. 1-9) identified the line of David as being the focal point of that hope. 1 Chronicles 15 connects the line of David with the ark of the covenant/temple and the establishment of right and true worship of God according to the will of God: “[David] prepared a place for the ark of God” (v1); “David said” (v2); “David gathered together the sons of Aaron and the Levites” (v4); “David commanded” (v16); all of this was to establish the right worship of God, according to the Law of Moses (v15). This hope is fulfilled in Jesus, who establishes right and true worship of the Father “in spirit and in truth” (John 4:23).
The line of David is further established as connected with the ark of the covenant/temple and the establishment of right and true worship of God in verse 27, in which we see David is wearing a linen ephod, just like the Levites who ministered at the ark and then the temple. This is a type of the priestly role of King Jesus, who establishes right worship in us by his intercession to the Father on our behalf, sanctifying our worship through the imputation of his perfect worship to us.