I'd love to get a new imac with 4K display! After getting myself a retina Macbook, my 27" iMac's display suddenly feels so old

. First world problems for sure, but it always seemed a bit weird to give a Macbook the best display Apple could offer.
Bringing 4K to iMac and Thunderbolt Display would make the Retinavolution of Apple complete

Apple loved to talk about their new Mac Pro last year as 4K-capable (even up to 3 4K-displays a they say) and then... silence. Nothing. Not a hinch of anything 4k-related anymore. Promoting the 4K-Mac Pro while not releasing a 4K Thunderbolt Display is literally telling people to buy from other companies!
I've read some skepticism here, but I certainly do not agree. 4K must come and must come this year I say!
- "too demanding for the GPU": Apple's Retina MBP is driven by a Intel IGP... Do I need to say more? It is true however that it'll be impossible to play games at decent fps on the iMac at 4K, but who is saying you need to play games at the native resolution? 1080p looks like native on a 4K display since the pixels match! That means 1080p will look even sharper on a 4K iMac/TBD then on the current iMac/TBD!
- "still 30hz": Samsung is releasing a 28" 4K@60hz Display next month at 699 dollars: http://pcmonitors.info/samsung/samsung-u28d590d-28-inch-uhd-4k-monitor
- "too expensive": Are you calling 1000 dollar for the current Thunderbolt Display cheap then? It was 1000 dollar when Apple released it as the Cinema Display in 2010, a time when 27" LED IPS displays were very expensive. Why is it nowadays different with 4K displays? As I noted before: Samsung is releasing a 28" 4K@60hz Display next month at 699 dollars.