I would assume some sort of upgrade... Correct me if I'm wrong but I think the 18mm RPP was vignetting a bit @ 5K - could be to fix that. (Don't take this as fact - just remember reading that somewhere and I know they improved the 17-50 to fix the vignetting problem on that lens)
The price of the used RPP will start to decrease. I'm seeing more and more people starting to sell their lenses.
Even if they discontinue the current line up and replace them with something new / different - it doesn't make the current lenses 'Obsolete'. They will still do the job and hold their value; PL cinema glass that's 20++ years old still goes out on jobs every day and still makes the owners money and the clients happy.
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