The first step is to define the targets it needs to intercept. I would expect extremly short reaction times in the future. As consequence, loiter time is more important than the classical attributes of an interceptor. The platform has to detect and engage ground hugging, stealthy cruise missiles as well as hypersonic targets.
Possible targets:
-conventional aircraft (rotary/fixed wing) + cruise missiles
-UAV swarms
-ballistic missiles
-satellites
The core of the concept is therefore a directed energy weapon, providing the necessary range and sufficient reloads to deal with drone swarms. -> new technology development necessary
The airframe itself should provide long loiter time in the first place, top speed is of secondary concern. All aspect stealth in radar, IR and optical frequencies. -> new surface materials required, airframe itself based on current technology
Propulsion: variable cycle engine for optimized loiter time prefered -> new technology development necessary
Sensors: spheric coverage by multispectral sensors. -> evolution of existing tech
The aircraft should be unmanned and of course network capable: evolutionary design of current datalinks and AI.
The largest obstacle is imho the weapon. Nothing existing provides the capability let alone is compact enough to fit into a fighter airframe.
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