I just crossed 350 and now can see review queue but not able to see review history. On clicking History option for any review it only shows my own reviews. But in Other site graduated or Public beta i can see all review history. Is it happening just to me or review history in Private beta kept Private?
Yes, this is status-bydesign. Viewing the full history for any queue is a "mod tools" privilege. We just added a small note on this to the mod tools privilege wiki.
I am only 3K on Stack Overflow, and I can only see my own history, but I am 10K on Meta Stack Overflow and I can see all. I think it is a 10K privilege (or the beta equivalent), so I am virtually certain this is status-bydesign