This looks like it will be a big success.
http://www.dpreview.com/reviews/OlympusXZ1/The final word
There will be some people who will reject the XZ-1 for not having an optical viewfinder but many will gladly forego the costs (both financial and in terms of size) that such an addition would bring. Unlike the Canon G12 or the less-impressive Nikon P7000, the XZ-1 is comparatively pocketable, and, in line with the axiom that 'the best camera is the one you have with you,' that's invaluable. And, if you must have a viewfinder, you can always add the excellent, though expensive, VF-2 electronic viewfinder available for the XZ-1 (or simply plump for the G12).
Aside from its lack of AEL/AFL button, there's very little to criticize about the XZ-1. Not everyone will be affected by the lack of such a button but as a function available on some point-and-shoots, it's a frustrating omission from a camera people will use creatively. However, this is just about the only major cloud in a sky that's otherwise the bright, cheery blue that this camera so loves to produce. The XZ-1 is a joy to use, quick and easy to control and small enough to make sure you have it when a photographic opportunity arises. In fact, many people considering a mirrorless interchangeable lens camera may find they're better served by the XZ-1, if they're not serious about buying additional lenses.
Notice the control dial around the lens. Canon S90 was the first to do this on a compact AFAIK.
AEL = Auto Exposure Lock
AFL = Auto Focus Lock