Hi Doreamon,
The photo show in February was mentioned a few times in different oversea forums. It is one of the major exhibition like the Photokina, etc. Some ppl are holding back their purchase as they expect Canon will launch new models based on DIGIC II, eg S500 successor and so on. By then all Canon camera should be able to shoot at VGA size full-rate. The concept of DIGIC II was to combine Video LSI and Photo LSI resulting in possibility of high-speed still-photo operations and excellant movie mode.
But IXUS40 has already reach the pinnacle of size for camera. It can be so small because of the UA lens. It has purple fringing and corner softness also because of UA lens.
Anyway, take your time to decide.
I have posted some pictures I took last Saturday. See for yourself what quality you can get with this camera, and whether you will be happy with it
http://photobucket.com/albums/v623/malcolmneo/
Feel free to comments.