Some of you have probably seen this map already:
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National Transport Network plan from State Council, to be completed by 2035. This is currently blowing up in Taiwan because as you can see, the plan calls for a link to Taiwan from Fujian.
So one wonders if this would be a bridge or a tunnel. But in fact recent documentary from CCTV suggests this would be neither. Instead it would be an entirely new tech called submerged floating tunnel:
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Currently still undergoing scaled model experimentation. But that should lend further proof that the cross strait link plan is serious. Draw what conclusions you will about how long a project like this will take and thus Taiwan's political situation.