It's true there have been several developments in Champions Online in recent years, which should count as "official" additions to the CU. If you're interested, legendary Champions author and veteran CO player Scott Bennie created a free PDF "lore primer" to provide new MMO players with some essential setting information. Said document adds CO events through 2017 to the official timeline, as well as provides useful perspectives on the differences between the two versions of the CU: https://drive.google.com/file/d/0BzHmfdC4jXPpVmxGd1ZxcHVfbFk/view
There is also some info in Darren Watts's Golden Age Champions for between WW II and the present day. That mostly involves legacy characters, i.e. descendants of or successors to that first generation of heroes. For example, it mentions that a fourth person has taken up the identity of Meteor Man in the present. But a few of the GA characters written up are still active today.
Plex reacted to Lord Liaden in Any Champs Universe Timeline Updates?