Star Tours? We don't know for sure if, or for how long, it will remain open, but Star Tours will not be part of the Star Wars land.
In Disneyland it's clear across the park in Tomorrowland. In Hollywood Studios it will separated from SWL by Muppetvision 3D, PizzeRizzo/Mama Melrose's. And while technically ours could be linked to SWL around the back of the Muppet area, I doubt seriously that they will do that.
Star Tours takes place in a different time period (or rather, somehow, all time periods at once,) and will not match the new style of the new planet created for SWL. It is not mentioned in any of the press releases or show up in any of the concept art.
I expect Star Tours will remain open for a year or two to keep guests happy and disperse crowds a little with SWL being so new and shiny. Then it may go away or be rethemed as something entirely new. We've talked endlessly in this thread about what may replace it. My money's on The Incredibles, (or just tearing it down and putting something new there.)
So yea, no one actually knows.