You’ll need to hold your breath a little longer, as not all of our competitors have listed their suggested changes. All the same, here is what I have so far:

Two-headed Cerebus -> Ruin Crab: Two-headed Cerebus is just a bit below rate, and Ruin Crab will be a premium card for our fledgling mill theme.
Better Duress (Duress) is errata’d such that if a player does not discard a card rather than reveal a card, the casting player gets to scry 1 and fateseal 1. Our players were playing with it like this anyway, so this change brings the cards rules to align with its de facto functionality.
Unnatural Siege (Unnatural Speed) now costs instead of . The mana cost was simply too ugly, and it probably isn’t too strong at 2BB.

I’ll update this announcement as more of the swaps come through.