Lightroom 4 and Photoshop ACR v7.0

 Early adopters of Lightroom4 (LR4) like myself are receiving  pop up warnings when trying to export Edit into Photoshop CS5. The Adobe Camera Raw (ACR) version used in LR4 is ACR 7.0 however Photoshop's ACR hasn't been updated yet resulting in the following warning:

This version of Lightroom may require the Photoshop Camera Raw plug-in version 7.0 for full compatibility.

Please update the Camera Raw Plug-in using the update tool available in the Photoshop help menu.

 The suggested method of updating doesn't work because again you can't update to something that isn't available yet!! Not sure what Adobe was thinking? Looks like a rush to market with little fore thought of the consequences.

 Adobe's response to user's question are:

Camera Raw 6.7 (currently available on Adobe Labs: http://labs.adobe.com/technologies/ca... ) provides compatibility between Lightroom 4 and Photoshop CS5. The final release of Camera Raw 6.7 through the Adobe update mechanism will be available in the very near future.

Camera Raw 7.0 (currently available on Adobe Labs as party of the Photoshop CS6 beta: http://labs.adobe.com/technologies/ph... ) provides seamless compatibility between Lightroom 4 and Photoshop CS6. The final release of Photoshop CS6 will be available later this spring. 

However some users are still having issues after updating to ACR v6.7. Some who have updated to v6.7 still get the warning, others are complaining about noticeably brighter images in Photoshop rendered images "Open Anyway" compared to those that were rendered in LR4 which appear to match the original. Jeff Schewe recommends rendering in Lightroom prior to Photoshop editing, or to instal ACR6.7 with the caveat of dealing with the know issues. I will move forward with Lightroom rendering rather than dealing with all of the unknowns of ACR6.7.