Sadly, the new 'Thin Series' don't have a means to remove the stand foot without a complete disassembly.
While Apple did offer a VESA mount version of the newer iMac after people complained. I don't know if they offer one for the 5K model.
== UPDATE ==
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You can buy the iMac with a VESA mount! Here's the link: [http://store.apple.com/us/buy-mac/imac-retina-vesa|iMac with Retina 5K display and Built-in VESA Mount Adapter].
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You can now buy the iMac 5K with a VESA mount! Here's the link: [http://store.apple.com/us/buy-mac/imac-retina-vesa|iMac with Retina 5K display and Built-in VESA Mount Adapter].
Sadly, the new 'Thin Series' don't have a means to remove the stand foot without a complete disassembly.
While Apple did offer a VESA mount version of the newer iMac after people complained. I don't know if they offer one for the 5K model.
+
+
== UPDATE ==
+
+
You can buy the iMac with a VESA mount! Here's the link: [http://store.apple.com/us/buy-mac/imac-retina-vesa|iMac with Retina 5K display and Built-in VESA Mount Adapter].
Sadly, the new 'Thin Series' don't have a means to remove the stand foot without a complete disassembly.
While Apple did offer a VESA mount version of the newer iMac after people complained. I don't know if they offer one for the 5K model.