Not much yet, but the site design is interesting, the plot summary is intriguing, and the cast list is complete. Joseph Severn is low on aforementioned list, and called "Mr. Severn"---suggesting he doesn't have an enormous role, which in turn suggests that we may not be getting an extensive death-scene.
(Though I seriously doubt that the lock of hair on the opening page is genuine, here's a fun related pseudo-fact: a drug test done on Keats's hair revealed that it contained opium [not especially surprising, as he was in a good deal of pain for a long while before his death and opium was prescribed as a painkiller...] A bit of details about the process here: http://query.nytimes.com/gst/fullpage.h
The synopsis makes me cautiously pessimistic. Seems they're trying to make Keats and Fanny's relationship into something dangerous and forbidden, when (and correct me if I'm wrong!) I don't think it was either.
However, I will reserve judgment until I actually see the film. I really hope this doesn't turn into another Gothic or Haunted Summer or Pandaemonium. Keats deserves a halfway decent shot at a real literary biopic, not a period romance that tries to get extra points for being "historically accurate."