There is a post dated March 29, 2012 on the Lightroom Journal that explains the issue. See the lin below. There are also several threads in the forum that address the issue. ACR 6.7 Release Candidate for PS CS5 is available that will assist.
nice non answer there
If you read the post in the Lightroom Journal you will get the full answers to the OP request.
1. you need ACR 6.7 Release Candidate in Photoshop CS 5 to be able to pass the raw data from LR 4.
2. Camera raw 7.x will not be available in PS CS5 you will require PS CS6 which is now available in release candidate.version. All the info you need is there.
I was just passing on the link to the official info from the head of the Lightroom team so the correct info could be viewed so there would be a minimum of mis-understanding.
I installed the ACR 6.7 RC yesterday but that is not the problem because it still doesn't read the adjustments to the raw file when passed onto photoshop. I'm shooting with Nikon D4, I don't know if there is a compatibility problem. Any other suggestions?