I have been watching the various US and Canada sites for about 6 weeks and they have had limited to no availability, it is even worse now. While a few weeks delay is disappointing but forgivable, it is even more frustrating that you cannot pre-order for future delivery (i.e. Dell Windows 8 tablets were in short supply in December, but at least they would tell you when you might get a shipment, even if it was a few weeks in advance). I bet there are a number of people who would pay up now and take delivery in a few weeks. The fact that they are not even doing that implies a much bigger supply issue, or maybe a cancellation as they plan for Surface 3? Anyone know of any leaks regarding a new machine, or a serious shortage of one of the components?
I've already offered my speculation regarding Surface 2 quantities. If I continue to be correct, don't expect the situation to improve for the remainder of this generation.
Where my crystal ball is fuzzy is in what is going to happen beyond Surface 2. It is possible that there will not be an ARM-based Surface 3...that the 2 will be the last ARM-based entry-level Surface. That would depend upon the real-world experience of the Bay Trail devices. If reality lives up to the hype, I can see Microsoft producing a BayTrail-based Surface 3 and removing WinRT from Surface tablets.
The previous rumors of Microsoft merging WP8 and WinRT8 may come to pass. But I don't think it will mean that a 10" Surface will run that new merged OS. I think that they will reserve that OS for smartphone, megaphone, and gigantaphone devices... upwards of a 7" screen capable of making calls.
My advice for people who are still looking for a Surface 2... stop looking. If you can find a killer screaming deal on an RT (highly unlikely at this time) go for it and enjoy it, or wait for the next generation. Because the more time that passes, the closer it gets to new devices being announced and released.