It amazes me that in less than two decades the Holman Christian Standard Bible is soon to be replaced. I wonder if this isn't mostly about marketing and sales, perhaps competing with the NIV? CSB may be a more marketable title. It will be interesting to see how much the CSB has actually changed from the HCSB (i.e. in the text itself). I did a comparison of Psalm 23, and found one line changed in it. So I wonder if it isn't more re-marketing than re-translating.
The link below gives Comparison Verses in the CSB, with explanations. The chart compares certain CSB texts with HCSB, NIV, ESV, NLT and KJV. I'm sure these are verses they prefer to highlight for various reasons.
http://csbible.com/wp-content/uploads/2016/08/CSB_VerseComparisons.pdf
I wouldn't think there have been any extravagantly great advances in biblical scholarship since 2004, but it is part of the marketing info: "With the benefit of up-to-date manuscript discoveries and significant advances in research, these translators, reviewers, and stylists exhaustively scrutinized ancient source texts..." In their online explanation of "Why" this Bible is needed, Lifeway/B&H notes there is a problem of people reading their Bibles less and less. We already have a plethora of new Bibles and we still have that problem.
One thing I noticed was that the HCSB capitalized "divine" pronouns and the CSB doesn't. I like their explanation "
Why doesn’t the Christian Standard Bible capitalize pronouns referring to God?"