I can think of many possible ways of expanding this tool – for example, a time range selector with a plot of the frequency of edits over time, for example: I expect people will be interested in replaying parts of an article history when edit wars happen or watch collaboration around trending topics/breaking news, I'm not sure the first N revisions are always the most interesting ones. However these are the first priorities to me:

1) having basic metadata (time/contributor) about a specific revision in the header sounds really important – I don't have any sense of the temporal scale of these edits when I replay them. A tally of unique contributors displayed at each frame would also be helpful.

2) how do you expect to handle very large articles (where you cannot fit the entire body of the article in a browser window)? Having to scroll to see what's happening below or above the fold seems to defy the purpose of a high-level visualization of edit activity.