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I have the 100-400mm and it is my second-favorite lens, which I use quite a bit.  I have the 1.4x TC on it, too, and leave it on the lens most of the time.    I am not sure when the 100-400mm first came out but I think it was much more recently than the original 70-200mm that has now been replaced by the 70-200mm II.   If you want the 100-400mm, buy it and enjoy it now, and if at some point further down the road Sony does release an updated version, sell the original and buy the new one.