Congrats on finding this place...very nice forum...and very good camera...
Yes the SD15 will be out between Feb. thru May as per my phone conversation with Sigma...I do not know when exactly...The problem...is that the price point will probably be around 1000.00 US....so that is why I opted to purchase the SD14....the difference will be the storage and speed of the camera...the proccessor..from what I have found out...but the sensor will remain the same...as of now...I did ask about video and was given the official they do not know at this time...could mean yes/no...if I was a betting man I would say yes and that is why it is delayed....
That being said...the SD14 can be purchased for 429.00 which is a great price...also you can get a kit with an 18-200mm OS lens for about 699.00 you cannot beat that combo....
I would opt (as I did) bite the bullet now....and when the SD15 come out you can probably get rid of the SD14 for about what you paid for it...or have a very good backup...which is what I plan to do...Right now I use SD14/SD10 combo as well as Nikon D300....
Let me know if you have any other questions....also Klaus is a very good source of information...see my post on using old nikkor lens with SD14...best bet to get cheap older lenses that will make the SD14 pop..
Have fun shooting...
Tony C.