Looks like Apple is gearing up for the Verizon iPhone by releasing iOS 4.2.6, Build 8E200 to developers. Verizon users in the US will soon be excited to use the iPhone 4 on their network.
The notable feature that debuted on iOS 4.2.5, was the announcement of Personal Hotspot. Rogers has already mentioned they would support this feature if it becomes available for iPhones in Canada. There has been no mention of pricing.
In regards to jailbreaking the Verizon firmware, MuscleNerd has tweeted the keys to this firmware, asking people to share what they can find.
If you want to go crazy and try installing iOS 4.2.6 onto your non-Verizon iPhone, you can so do here.