Key words in your post.
“When they become available.”
There not out yet and since there not, there not up for discussion or consideration if your ready to purchase & use now. It’s like your pointing at a ghost.
Every once in a while, some knot head says something stupid to me.
“You should have went with the Edelbrock Victor head.”
I say “That would have been an excellent choice IF the head was available at the time I built the engine but since it was not available, how does your comment help?”
You can use what is not available to you.