Is the 5k Dell monitor also made by LG?
I'm not sure, but one interesting thing to note is that Dell originally planned to sell its 5K monitor for $2,500 MSRP -- same price as the iMac, but minus all the PC parts. That might be a tough sell.
Ironic as it may seem, Apple may have helped drive down the cost of an emerging technology, depending on how things shake out.
You can get 4k monitors now for $700 AUS. so selling a 5k monitor for $2.5k will be near impossible.
I don't know if i will make the jump to 4k as of ye let alone 5kt, maybe 1440 for my next monitor but 4k will need some sli action for gaming for it to get over 60fps.