Upload & Sell: On
I am no fan of Adobe's new subscription-only software scheme but here are a few comments:
Regarding #2, both the previous perpetual license scheme and the new CC scheme allow you to install the software on two machines, with the assumption that you are using only one at a time. The new CC goes beyond that slightly by allowing those two installs to be on multiple operating systems (Windows / Mac). With the perpetual license, both installs had to be in the same OS.
Regarding #3, I think a price increase is what everyone worries about - even folks that are currently happy with CC. I think it is a legitimate concern. Adobe certainly hasn't shown any qualms about using existing customers' investments in the Adobe eco-system to force them into the software rental model so I see no reason why they wouldn't use that again to accept a price increase. They will have an even stronger position now since a customer will lose access to their existing software if they stop paying, not just future upgrades.
For #1, that is going to be a very personal decision, depending on the kind of work you do. For me, none of the things you listed are earth shattering. I would probably have paid for the upgrade under the old model just because I'm a geek and like playing around with that stuff but I am suspending my Adobe purchases for the foreseeable future. I don't like the way Adobe handled this thing and I think the rental model gives Adobe too much power in the supplier/client relationship (and Adobe already had a great deal of power anyway by being a pseudo-monopoly in the marketplace).
The camera shake reduction would have been the most intriguing for me but I have had Focus Magic for some time and it does a pretty good job. It doesn't calculate a variable path for motion blur like the Adobe filter but none of these de-blur filters are going to make a blurry image perfect anyway.
The smart sharpening improvements are OK I guess but for me, it sounds like they are finally getting around to making Smart Sharpen work right like it should have when they released it originally. It just emphasizes to me how Adobe abuses its customers on these kinds of things - lots of investment on marketing and advertising and quid-pro-quo training and blog relationships but the software improvements are when they feel like it and with the quality they feel like pushing out at a given moment. I can't see that situation getting much better now that they will have a captive base of rental customers.
The Smart Object improvements are also OK I guess but I have always found Smart Objects as sort of a kludge. They can also cause your files to grow enormously.
The upsampling is another too little, too late thing IMO. You really only need it if you regularly make big enlargements and with today's high mega-pixel cameras it may not be necessary even then. If you do need it, there are also third-party options that are just as good.
Good luck with your decision.