Update 18 Jun 2013: It's come to my attention that the Ontario government actually gave a $263 million grant to Ubisoft to create 800 jobs at a new Toronto studio over a 10-year period. That is, taxpayer money has helped fund their Toronto studio, and now Canadian consumers of their products are being treated as criminals-to-be for it. Lovely.

Original text: Ubisoft will be moving its infrastructure from one data centre to another next week, starting February 7, 2012. Ubisoft announced this in a community letter. There is no indication of when exactly this blackout will be end.

While the community letter appears to explicitly suggest that Anno 2070 will not be affected by the transition, note the following line with regard to Uplay:

Uplay PC will be not be available during the transition.

PC games will remain available for all players who have already connected at least once.

If you have not connected to Uplay within Anno 2070 at least once before the 7th, it is highly likely that you will not be able to activate the game until the transition is complete and, given the game's previous finicky performance as to whether or not it will allow users to play offline (many players have encountered difficulty starting the game in offline mode), it is highly likely that you will not be able to play single-player either.

This problem is caused by the extremely restrictive always-on DRM (digital rights management) used by Ubisoft. Ironically, players who have pirated or cracked the game will be unaffected (they are guaranteed to maintain the same abilities in-game, with some features such as Ark storage unavailable).

A friendly reminder: We don't represent Ubisoft here. No one here works for Ubisoft either, and we can't answer your questions and/or complaints. If you have such questions, it is best to direct them to Ubisoft's Consumer Service.