now i've googled the hell out of this question, and youtubed all day some say there will be one coming out sone? i still have 3.1.3 and don;t kno if i should upgrade yet or not thank you!
In other words, the answer remains NO.
(We've been hearing about the iOS4 j/b for a month. Do not offer grains of salt, just don't mention it - it confuses the newbs.)