We met with David Kim, Dustin Browder, and Bob Fitch to discuss the origins of StarCraft's most iconic units.
-- From the article preview available through the Battle.net Launcher
To give some more substance to this OP, the general flow of the article is that they explain how they approached the process of selecting which units to keep, modify, or create for SC2. They discuss why they kept the BattleCruiser, removed the Dragoon, so on and so forth.
Personally, I found it an interesting read to see how Blizzard, at least at this time, looks back on the units released in 1998 and to hear more theoretical explanations for the decisions that they made. I would say that it feels more earnest and better-explained than some of the statements I've read in the past from Blizzard concerning both BW and SC2, although I admit that I haven't read that many.
I think it would be relevant for both BW and SC2 fans to read through, which in my opinion certainly seems to be a focal point of their approach to the universe - making the new palatable to the older players and vice versa. This is to say that I wasn't sure which section of the forum to share this in (BW/SC2/Blogs/PM a moderator for a community post or something), but since BW is where I spend most of my time and I found it relevant to my interests, I figured I'd share it here. I also had to shorten the article name to fit in the title and give it a tag.