Here is the pricing.
What is the Adobe Photoshop Photography Program offer:
This offer includes access to Photoshop CC and Lightroom 5, plus feature updates and upgrades as they are available; 20GB of cloud storage for file sharing and collaboration; and Behance ProSite for your own fully customizable professional portfolio. That means you get all the benefits of a Creative Cloud single-app membership for Photoshop CC, but with Lightroom 5 included as well, for a terrific monthly price (all prices are exclusive of VAT/local taxes):
North America $9.99 USD
European Union €9.99 EUR
EMEA non-EU $9.99 USD
Australia/New Zealand $9.99 AUD
Asia Pacific $9.99 USD
Japan ¥1,000 JPY
United Kingdom £7.14 GBP
This offer is available to customers who own a previous commercial version of Photoshop or Photoshop Extended, version CS3 or later (CS3.x, CS4, CS5.x, or CS6). Suites and volume licenses do not qualify. Requires an annual commitment with monthly billing. Available for purchase from September 17, 2013, through December 31, 2013 from Adobe.com only
Customers who sign up by December 31, 2013 will be able to continue their membership. This price is not a special introductory price for your first year only; it is the standard price for this level of membership. But if you cancel your membership in the future, you will not be able to re-join at this special price.
From this wording, I guess they can raise the price of the photography program when they raise pricing for the other CC offerings, or for just about any other reason. I'm still going to sign up and cross my fingers that the pricing stays consistent for a long time.