Tracking updates for an individual paper in arXiv Albeit arXiv offers RSS news feeds for subject areas updates, it is also possible to track an individual paper for updates (such as if it was submitted and/or accepted to a journal)?
This is a pretty silly solution, but you can use a page tracking service to see when the page changes; this should detect both changes in the paper as well as in the journal its submitted to.

Edited as per Jaap Eldering's suggestions in the comments: you can use arXiv's OAI-PMH protocol to programmatically access version history! For example, if you want to look up arXiv #1206.0094, you can look up http://export.arxiv.org/oai2?verb=GetRecord&amp;identifier=oai:arXiv.org:1206.0094&amp;metadataPrefix=arXivRaw for its version history.

Furthermore, arXiv does have an Atom feed for individual articles: you can access it at http://export.arxiv.org/api/query?id_list=1206.0094 -- the link it includes is to the latest version of the article, so I presume it will change if the article is updated.