follow @planetbeing , @comex , and @musclenerd on twitter for all the iphone 4 jailbreaking / unlocking updates
as of now planetbeing does HAVE a jailbreak and unlock for the iphone 4 they are still fine tuning it though.
4.1 has been released to the Apple devs, It's only a beta and there are hardly any changes. Sources say that there's no change in the reception issue. But the modem firmware has been updated to 02.07.01.