Just wanted to let all the other Nava Thai fans know - I went there this weekend and the rumors are true.
Their lease expires at the end of this month (November 2008) and their landlord is NOT renewing it (I believe it is going to turn into a Pho restaurant). The Nava owners are searching for a new location but do not yet have one (though Rockville and Bethesda were mentioned as possible locations).
If you are a Nava fan - better go there before the end of the month and get your fix. Oh and don't forget to sign up for their email-mailing list so you can get updates.
As for Wheaton - there will always be Ruan Thai :-)