I hope there is no problem, as I also ordered custom cablesSorry if this was answered but I wasn't able to find it searching this forum/thread.
I preordered a V6 and I'm going to get custom cables that were fitted for the M1 V5. Will there be any issues with cross-compatibility?
I was told that the old position for the PSU is still possible, so I think there should be no problem. However, in principle it is now possible to have a new position for the PSU which would provide more space for CPU cooler (like a C14S with 140mm fan).
So, if we order v5 cable, it should work but that new position won't be possible. Ideally, shops like pslatecustoms will make a new option for that new mounting position. I guess that will happen once people start receiving the new case