The numbers are staggering, but I find this story fascinating.
First there's star that has a radius 5.5 times bigger than the orbit of the earth's (and even bigger than the orbit of Jupiter which is 5 times that of the earth).
Then in the past 15 years it has shrunk by 15% (a distance equal to the orbit of Venus).
Now a great deal of what I know of the bad things that can happen in astronomy I know from science-fiction, but shrinking stars are never a good thing.
If I start hearing that they're seeing lots of iron in Betelgeuse's spectrum, I'll be watching for a pretty light show in the near future.
I'm hoping Phil Plait has something to say on this pretty soon.