While AT&T is always adding new channels to the U-Verse lineup, there isn't necessarily a public date shared until the very last minute due to various legislature that needs to be agreed to (among other things). The good news, though, is that there is a website available for you (and your friends) to request additions to the line-up: http://uversechannels.att.com/ The more people that request a channel, the faster it gets brought up as a potential addition, so make sure you pass the information along to those local to you.
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For that info you should try calling 1-800-288-2020.
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I have worked for several years in customer service for at&t. I have an in depth understanding of billing, workarounds, troubleshooting, and key advantages of at&t services over choosing other providers and ways to lower your bills that are not general knowledge to the public.