Except their small Cube speakers, non of their bookshelf or floor speakers utilize front firing tweeters. Their speakers feature Bose proprietary Direct/Reflecting speaker technology which mean only a small percentage (about 11 percent) reaches you directly. The rest is reflected off the walls. And that design haven't change over last 30 years.

Since Bose have such a exposure in chain electronics store (such as BB or CC), and a monstrous adverting machinery to match, they probably could capture a slice of "front firing" speaker design market if they decide to design such a speakers.

I wonder why they haven't explore that avenue?