Along with the CNTTS Critical Apparatus this is one of the best new features. As part of the Bibleworks Manuscript Project you can actually browse and do text critical studies on photographs of real MSS. I have heard that this is only the beginning of this project and that BW hopes to provide many more MSS.
You will have a window that allows for transcription notes and there is a window that compares several MSS while highlighting the differences between several MSS on a given verse of Scripture.
The video shows much of what you need to know, but if you have any questions I’d be more than willing to use this feature to find an answer for you!