It is very likely this is nothing to be worried about. Magma moving deep inside the earth, and perhaps a few related steam events. Were the big one to happen there would be lots of warming. Ground would lift tens perhaps a hundred feet long before a super eruption, numerous lessor vents would erupt days/hours before the big one. Also the big one would be immediately preceded by a large earth quake. This is just another interesting day at Yellowstone.
Interesting for sure.