It depends. I bought my ps3 in October 17th and I was looking for a 160gb white in Taiwan and the fw was 3.42 in a store but another one was still 3.41. Now it's all above 3.41 here and you only can find 3.41 or older if the store has the product a long time ago. Most of the 320gb still has the 3.41 fw.
In Brazil, it's all 3.41 or older fw. If you are going to buy, please ask the seller and test the product before you buy it.