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It's very unlikely non retinas will get a refresh. Possible, but unlikely. Like everything else Apple release, as soon as retinas come in, the non's get phased out. You can almost guarantee come October, you'll have 4 different 5k options and 1 non retina.
 
Given that they effectively downgraded it when they did the most recent iMac refresh I doubt we will ever see it again.

There will likely be one for sale on the store for some time to come, like the non-retina macbook pro, but it will never be updated and eventually will disappear.

It's a shame, since it was an almost perfect machine. A hard drive/SSD door and a Maxwell GPU was all it needed to be truly outstanding.
 
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