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b) redsn0w now has an untethered jailbreak for the 3gs and 4 (NOT 4s or 5): http://blog.iphone-dev.org
c) as for iPhone 4s and 5, there's no estimate. have a random news article:
http://www.idigitaltimes.com/articles/12072/20121022/ios-6-untethered-jailbreak-iphone-5-news.htm