If anyone has been watching the earthquakes worldwide today, you might have noticed that there have been three >M2.5 earthquakes in the Yellowstone Caldera today at depths <10 km. Not to say that it is anything, but just something to note.
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I will be at Yellowstone next week. I'm not worried though, I know the odds are really small something is happening and that experts are always watching things.
On the subject of "super volcanoes", since modern man has never seen one, we really don't know a lot about what the precursors would be. I assume that of a "regular" volcano, but maybe just on a much bigger scale and maybe lasting longer? Interesting to speculate.
Once upon a time, I was told about the incredibly high heat flow measurements at Yellowstone while on an FOP trip (Friends of the Pleistocene). We were taken on a boat to the location in Yellowstone Lake over which the readings had been made. Needless to say, a lot of sudden and excited (worried?) speculation ensued. I've been keeping an eye on Yellowstone ever since.
Looking at the seismic data they have had a nice little swarm of small shallow earthquakes at Yellowstone over the last 24 hours or so, the vast majority are inside the Caldera. It is almost certainly business as usual at yellowstone.