Will the Ultra V8 have HCCI?

I was browsing today & came across the news from the Geneva auto show about GM's new 2.9l V6 diesel.

It rang a bell for me, so I rummaged through some old bookmarks and came across this post.

I originally dismissed the post as being nonsense or unbelievable, but now with the 2.9l being officially announced, it makes me wonder about the 4.5l V8 being mentioned -- is it the Ultra V8 rumored to replace the Northstar? HCCI huh? Sounds cool!

I think that 4.5L V8 is a diesel V8 and not the Northstar's replacement.

this topic in powertrain tells more basic info about the engine mentioned.