Here is a bit more information from NASA on what to expect:

Obviously let’s not get too excited just yet, because we’re far from having any concrete confirmation that such an announcement on the cards. But NASA did tease us with their press release. “Exoplanets, especially small Earth-size worlds, belonged within the realm of science fiction just 21 years ago,” they announced. “Today, and thousands of discoveries later, astronomers are on the cusp of finding something people have dreamed about for thousands of years – another Earth.”

That is not typical of the descriptions they use before announcements so I am actually anticipating something new as opposed to something generic.

Just a note, an exoplanet is one that orbits a star, like the earth.  We have detected some of them with the Hubble which is why announcing something new in this arena is so exciting.

And here is a cool video below on exoplanets since we are on the topic!

thanks to sciencealert.com for the great info

thanks to Cal Tech for the pic