Last night got some hands on with the HTC One M8.
Feels lighter than the old one, metal finishing don't feel as
shiok, useable screen size same as the old one. Yes, the
touchscreen buttons take up the same space as the one that didn't
have it, so the phone is longer by exactly the same amount the
touchscreen buttons take it.
Didn't like the glossy plastic on the top. Can see all the
scratches on it.