Interesting question to ask! Will the newly released Verizon iPhone 4 be jailbreakable? Well well well, Apple should fix death grip issues in the new Verizon iPhone 4 and to do this, it should port redesigned antenna system so that it works on CDMA network.
However, if the bootrom is different, Chronic Dev Team have their own exploit known as SHAtter which was saved in case if Apple changed the bootrom.
In brief, either Verizon iPhone 4 carries the current bootrom or new bootrom, it'll be absolutely jailbroken once it ships to the hackers. Stay tuned for more information as it comes !