I found by reading the Harrisburg Pike Study what streets will be connected. Liberty Street will be connected with College Ave. (another reason to put right-turn lane at College instead of at Race) at a cost of $900,000; Mulberry Street to Clay at a cost of $1,600,000.
Both costs are for the roadway construction only and do not account for the Norfolk-Southern Railyard Relocation that must occur first. Both are listed as medium priority (5-10 years)