Are we talking about "additions" to the catechisms or "revisions." Quoting the article: "Addressing these societal “changes in understanding” — and even legislation — in such areas as same-sex marriage, beginning-and-end-of-life issues, drug legalization and religious liberties is a main rationale behind the impetus to update the Explanation."
These look like additions to the catechisms. I also think they are necessary, but let's no keeping changing the wording of other explanations that area already clear.

I hope you are not considering (again) to revise Luther's explanations to the basic Christian Doctrines. The following is what I would say about that:
"What can’t we do what M. Luther said to do, “First, the pastor should most carefully AVOID teaching the Ten Comm., the Lord’s Prayer, the Creed, the sacraments, etc.
according to various text and differing forms. Let him adopt one version, stay with it, and from one year to the next keep using it unchanged…” (SC, p. 244, CPH, 1986).
Here we are, attempting to “improve” [again] what had been very good for a long time.
I think it is a good idea to have the catechism with the ESV, but leave the explanations are they were (with the 1943 edition). Aggravated by the constant changing!"