I've not been following Redis a lot, so this one is new to me. I read antirez's original Streams blog post[0] but it feels like it's missing some stuff--is it known out there how this interacts with Redis Sentinel or, separately, Redis Cluster?
In the Redis sense, streams are just a new data structure (value type of a key), so there shouldn't be any special concerns with regards to Sentinel, partitioning and/or clustering in that sense.
[0] - http://antirez.com/news/114