the font is one of the bb preinstalled fonts, i think casual as well. With as many bugs and updates there are right now i am sure that there will be super early leaks like this for a while.
just wait and see what happens with it time will tell if someone is lieing
it could be real.. I opened the image in photoshop and It didn't look like major erasing or anything.. I didn't look extremely close at it but it could definitely be real..
However I am sure we will see a few os updates/leaks in the coming months..
The font is BB Casual. This is very real. I have seen OS releases in the past jump over 70 points! IE: 4.7.0.65, to the next official release being 4.7.0.138. Of course every number in between gets created and tested. I am sure a number of people have each and every OS at some point in time and they can take a screenshot just like we can.
You'd also think if someone were to have some insider way to upgrade like that and be able to 'prove' it, they'd also list a bunch of things they notice different or better. You'd think...