I didn’t exactly say that (it wouldn’t “make sense.”) But I suggested that it might not “need” to be on the entry page.
(Ie, perhaps it’s easier to implemented the listing as it’s own page. I am coming from a programmer’s point of view. If you want an example, then this Discourse forum software can serve. Notice the links along the top? They display separate pages with various filters, that display the topics from the forum database in different ways.)
It does not take any redesign or much change for the entry page (except perhaps adding links.)
It would avoid the inevitable argument over where in the order of sections the New Releases should appear. (There have already been conflicting suggestions over what order the section should appear on the entry page.)
The “What’s New” (or “New Releases”) page can have it’s own style or layout. (Ie, I suggested a blog-like styling. This is not a new idea. The official SketchUp blog has highlighted nifty extensions several times in the past.)
As it’s own page, with it’s own style it could display some additional information than the simple “tiles” that the entry page uses. (Ie, what category tags does the extension have, as this kind of listing would be from all of them.)
As it’s own page, it could have it’s own display order or filtering. (Alpha by category, or only certain categories, etc.)
ADD: It also occurs to me that there is space for 2 extra “catagories”.
The “New Releases” could be a pseudo-category that any extension can be a member of for n amount of days. (Same for “Recently Updated”. It could be an automatic pseudo-category.)