This was said by HTC on the matter today (friday March 22nd):
HTC has seen unprecedented demand for and interest in the new HTC One, and the care taken to design and build it is evidenced in early reviews. The new HTC One will roll out in the UK, Germany and Taiwan next week and across Europe, North America and most of Asia-Pacific before the end of April. We appreciate our customers’ patience, and believe that once they have the phone in their hands they will agree that it has been worth the wait.
And I can tell you: It IS. Just end of story.