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We will add 4.2.1 to the firmware list in the next few hours. I will post a link in this thread once we add it.
Thanks for the question!
We have added the firmware. Here's a link: http://www.guidemyjailbreak.com/how-to-jailbreak-iphone-4-421
Please let us know if there's anything else we can do for you at all!
Have a great day and happy jailbreaking!
If you need help finding it, check out this video: http://youtu.be/8D88c6_BsNI
Ahh, yes. Unfortunately it is a tethered jailbreak. It might be worth it though!