Our plan was to have it out this summer and this may still happen.  However, we are currently putting the open-beta on hold while we resolve some issues and concerns.

The main issue we have to address is traffic.  We have learned from the open-beta of Legions that we need to be better prepared for the influx of traffic so not to ruin current and incoming user experience.  All our current information indicates that the initial inflow of Mac users will huge and probably bring IA to a crawl (as it is currently stands).  When articles about IA hit the Mac news sites, the spikes in traffic are just huge.   So we are currently ramping up new servers and trying to prepare for the traffic.

The plug-in and games are working great, there are a few issues that are being resolved, but nothing major. 

Also there are some details of how the launch will be publicized announced that are being finalized.  (there is actually some cool stuff potentially there).  But since that is not finalized, I am unable to discuss it.

So with that, we currently do not have a date for the open-beta, but we will announce it when we have one, and it will be soon.  The alpha will continue, and development is ongoing. 

We will keep you updated as we resolve these issues.