Downloaded the newest Beta yesterday, so right now no deep testing yet,BUT:
Client sent me a PSD file today. Format 400 x 150 cm, 150 dpi, 580mb.
Double clicked and it opened in PS Elements. Took ages to open, when arranging some pics program told me `not enough disk space`(5,6 Gb free). Adding a filter was a nightmare. (History:0, 90% RAM available).
Closed it, opened it in AD. Opened in a sec. Everything smooth, live preview of filters worked like a charm. Job done. LOVE IT.
While I tend to use AD mainly for illustration that was a nice surprise. Cant wait to see what your Photo app will bring us ;)
One little wish: when I open the document settings (or any other menu) the active window is not in the foreground. When I have a brushes palette or anything similar it will stay in front. Would be nice when the ACTIVE window would be always in front. Just a little thing for convenience :)