Just heard a long segment on the Today current affairs radio 4 programme (in the UK), about the ESA BepiColumbo mission to Mercury. It has just done its first flyby of Mercury - the first of 6 before it gets captured into orbit in 2025.
My interest in this, is that I was overall project manager for one of the 12 instruments on board - the Mercury Imaging X-Ray Spectrometer. That uses X-Rays from the sun, the reflected X-Ray light from Mercury having the spectrum of the elements on the surface of the planet - so how much iron, silicon etc, with a 10km resolution.
It was launched in October 2018
After shakedown to make sure everything worked after launch, it then did a maneuver past the earth to send it on its way to the inner planets. Since then it has done two Venus flybys and yesterday the first Mercury one.
So why go to Mercury? First because it is a rocky planet that has never had an atmosphere, so to learn about how the earth might have formed, Mercury is a good place to learn. Also it is the second densest planet in the solar system - very close to the Earth's density. In addition it has a magnetic field (no-one knows why), and ice at the poles (which is weird given how close it is to the sun).
US interest in Ariane 5, is that the James Webb Space Telescope will be launched on one of those, imminently.