Sadly this is not OS 5.0 but at least AT&T is trying to keep up with their latest release of OS 4.6 for the Bold. Joshua let us know about AT&T releasing OS 184.108.40.2064.
BlackBerry Handheld Software v220.127.116.119 (Multilanguage)
Package Version: 18.104.22.1689
* Applications: 22.214.171.1244
* Software Platform: 126.96.36.199
* File name: 9000M_PBr4.6.0_rel519_PL188.8.131.52_A184.108.40.2064_AT_amp_T.exe
* File size: 96.79MB