Must have been a costly stunt to change the name. Changing the logo's on the products, user manuals and other documentation material, website, establish a new legal entity, etc.
It wasn't just a name change for the sake of change. They haven't changed their name, Agilent still exists. Keysight is the T&M division spin off. They created a new company, just as when HP spun off the T&M division in 1999 and called it Agilent, and kept the HP name for their printer/scanner/PC division. Over the years, Agilent has turned itself into a Life Sciences, Diagnostics, Genetics, and Biochemistry company.
They wanted to spin off the Test and Measurement Division of Agilent and so they created Keysight. Crap name, but same people, same products.
The rest of Agilent is much bigger than the T&M division. They make processing equipment for Biochemistry, Genetics, Biology, Pharmacology, Criminology, Forensics and Toxicology, Medical Diagnostics, Life Sciences, NMR, Spectrometry, Chromatography, Food and Agro test products, Telecommunications and a whole lot more than I've said. (maybe they are out of Telecom now)
While they may have started off with Hewlett and Packard in their garage making test equipment... that became such a small part of what Agilent did today. It is, however, the part that we know intimately (as electrical and electronic engineers).
As for what's next, I think this is good for the T&M division, as Keysight. They can grow bigger, focusing on T&M, and it will probably be easier for them to develop new products now. I suspect it would have been a yearly headache getting budget money for things they wanted to do, asking up the chain of command to a CEO that ultimately was focusing their company on Life Sciences, Diagnostics and Genetics, and furthering their acquisitions in these disciplines. Now they are their own boss.