My speculations of the future Chinese cruisers:
general features expected:
-application of APAR or PAR: since the PLAN wish to control the airspace near Taiwan, also have the ability to coordinate hundreds of units in operations, the new cruisers are likely to feature improved PAR or APAR from the original 52C DDGs. Better supercomputers are needed to process more information, to track more targets, coordinate more units, and serve as Command and Control center for fleet ASW and AD center. Also the future application after the unification of Taiwan would be to challenge the control for the Middle east, West Pacific, and trade routes to South America. Those regions are vital to ensure that sufficient amount of oil are "flowing" to China.
-standardization of hot launch systems with the rest of the fleet
-new short range missile systems similar to ESSM and Sea Ram. Currently such system has not yet had its debut. However, we know that PLAN is studying the USN closely, and the current trend is clearly demonstrated by the new Arleigh Burke Flight IIs which lack CIWS and rely its close in defence on VLS ESSM. It is crucial for PLAN to develop such systems.
-VLS medium range missiles (<100km) might also be operated to save space
and thus carry more missiles.
-cruise missiles would definitely be incorporated if land strike is necessary. However, if the PLAN doctrine requires such cruiser to have substancial capabilities against enemy surface combatants, then the limited space would be used for VLS antiship missiles capable of ripple firing.