I would like to purchase the Photoshop $9.99/mon subscription special. However, I think I might want to upgrade to the complete package after a few months. How does that work? Will my Photoshop subscription cancel automatically after I sign up for CC? Or would I need to pay for both subscriptions ($9.99+$49.99/mon) because Photoshop subscription requires a year of commitment? I think the latter doesn't make sense, but still want to ask just to make sure. Thank you.
Well, it makes perfect sense, considering it is a special offer... Of course you can simply cancel it and let it expire once you buy a full CC. Technically there is nothing that standas against it.
Upgrading from PS/Lr bundle to a full CC subscription is no problem. I did just that only a month or two ago. They cancel your existing subscription from that point and sign you up for a new one effective immediately, there's no extra charge or overlap payment.
The best way is to do it through chat; you'll have it up and running in less than five minutes. All you need to do is sign out and back in to update the CC app.