This is all just my speculation, here are some events which happened recently for ADA and XRP:
-Cardano founder Charles Hoskinson announced plans to work with the incoming Trump administration to develop clear crypto regulations.
-Charles Hoskinson talked to the CEO of Ripple (Brad Garlinghouse), and it seems like they buried their beef. Also Charles was saying the CEO was "extremly collaborative"
-Now he had a talk with the Chief of Technology (CTO) of Ripple. Maybe they plan to collaborate and that's why he talked with the CTO of Ripple afterwards?
-Trump plans to remove capital gains tax from US cryptocurrencies (this would include XRP and ADA)
- There is a rumor Brad Garlinghouse met with Trump
There are many common grounds and goals and a very promising environment. The market is reacting and the price of those coins are moving despite there is not an official partnership announcement.
(Sources in comment, can't post links in my post without getting auto deleted)