it's online, however not fully functional atm:
Today we are making available Time Attack and a preview of our new user interface (UI). With the new user interface you will be able to
- view scheduled seasons and sessions
- join/withdraw from both official and non-official sessions
- create and join hosted sessions
- launch test sessions
- update and purchase content (via redirect to existing membersite)
- view and join time attack competitions
- view time attack standings
- time trials
- VR
At this time, you cannot use the preview of the new UI to
- use web team or league functionality (However you could join a league race directly from hosted)
- access the forums
- paint items
- view results or other statistics
- manage your account/profile/friends
- file protests
- manage replays
- spectate or ghost (outside of TA)
- drive like an alien (unless you are one)
The post this is taken from, tells you where and how to log in:
http://members.iracing.com/jforum/posts/list/3560390.page