Yeah, I've seen lots of new high end bikes with a 27.2 seatpost. A few years ago, the conventional wisdom was that seatposts just didn't affect ride comfort at any noticeable level, either aluminum or carbon posts. Now, just in the last year, all the bike review sites can tell the difference between 31.8 and 28.2 posts.

The bikes all have newer model saddles, and some have 25c tires. Both of those things would make a bigger difference than a seatpost.