Yes, the new Twilight Hack has been released that works on 3.3. However, remember that it also fixes the signing bug that some of the older IOS versions had, although that doesn't really matter if you don't have a modded Wii. Also, you can run them through GeckoOS/Region Free, anyway.
I would say not to update until you have to, but it's up to you. I don't think there is any real problems with 3.3 since the updated Twilight Hack was released.
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