My understanding based on some first hand accounts of those who've seen them is that the films are currently be re-mastered in 4K, but for overseas use (I think some french channel wanted to air them or something)... Apparently though they didn't plan on releasing these on Bluray or anything since they were going to soon be re-doing them in 8K?
They talk about it a couple times on the James Bonding podcast. At any rate, hopefully they'll see the light of day sometime soon. I love my 007 50th Boxset but there are some flaws with it. Thankfully all my favourite films (other than Goldeneye) are in pretty good nick.