It's no secret that Lucasfilm is currently developing an Obi-Wan Kenobi movie. It's in the very early stages of development and we have no idea what exactly they are planning. What we do know is that the studio is looking at hiring Stephen Daldry (Billy Elliot and The Hours) to direct.
We also know that Ewan McGregor is up for reprising his role if Lucasfilm comes knocking. Who knows, maybe they already have and no one is saying anything. Now Liam Neeson is saying that he's open to reprising his role of Quin-Gon Jinn in the film if he's asked! While talking to Yahoo, he was asked about the possibility of returning and this is what he said:
"This is the first time I’m hearing of this. No one’s been in touch with me. I know in the Star Wars world anything is possible.
"In the first one, The Phantom Menace, I died but we know, you know, Jedis come back and stuff but no one’s been in touch. We’ll see."
The movie would have to be set between Revenge of the Sith and A New Hope with Obi-Wan on Tatooine when he was keeping a distant eye on Luke Skywalker. I'm sure he had many other adventures, though. It doesn't seem like Obi-Wan is the kind of guy that would live a dull an borning life.
It would make complete sense to see Qui-Gon Jinn visit Obi-Wan on Tatooine. This was actually explored in the Star Wars anthology book From A Certain Point of View, in a story called "Master and Apprentice". This story is actually set right after Luke Skywalker leaves Obi-Wan in a rush to check on his aunt and uncle because he fears for their safety in A New Hope. But, if he visits him at this point, there's no doubt that he would have visited him before.
Who knows what exactly Lucasfilm is planning for the movie, but it would be pretty cool to see these two characters back together on the big screen again, even if it just for a little moment.