Yeah that news is true. (but that news is old)
That is why we advise iphone users that do not upgrade your iphone until there is a release of hacking software for the new update also.

But now, Iphone version 1.0.2 unlocked can be upgraded to version 1.1.1.
(before, 1.1.1 will locked 1.0.2 iphone, but now there is update by hacking teams for 1.1.1.)

See, just be patience if there is new upgrade and don't push the upgrade button until it is said so.

Right now, the newest version so far is 1.1.1 and this is unlockable now.