I always wonder when we ask ourselves these questions they are almost rhetorical

- I suspect when the hands on reviews come in most will be very pleased. Part of that will be the excitement over a new body and let's be honest to justify it to yourself. It will be like the numerous answers on the K10D ==> K20D upgrade I would say it was about 75% to 25% pro vs con.
There is always the next thing coming out - it will always be a little better than what you have and there was always be a feature that you want that is not quite there.
From the specs I have read it seems to be a good upgrade , is it worth $1300 ? That is totally dependant on your personal situation. Some people spend that on a dinner , some save for years to spend that on a vacation.
IMHO - I am an enthusiast - I love to shoot , but it's a hobby I don't receive any financial gain in fact quite the opposite. I may get it , while I don’t spend $1300 on a dinner , I can afford it and can justify it as it a hobby and it makes me happy – pretty cheap in the long run. I will probably get one before Christmas and then when the next one comes out will look at that.
There is still so much I need to learn and so much I want to try in my photographic journey , my current equipment exceeds my skill set , but that won’t stop me from upgrading.
Not really much of a technical answer Will , but some of my random thoughts. Best of luck.