1.02.20 is the current 'release' version. However, there is a beta version available, 1.02.27. It has not been broadcast via an OTA (over air update), so a scan will not pick it up.
Some people have reported having some issues since they installed 1.02.27, although nothing 'concrete' so to speak. I have been using it and the custom firmware associated with that build since release and, to date, have not had any problems whatsoever.
Have a look ate the Wiki, a link to which is in the top left hand side of this page.