I've got the same problem. Just got a new Pre, and I noticed that the desktop site would "flash" briefly before the mobile site loaded. Now, the mobile site doesn't load at all...No idea what's going on, but I'm still researching.
this is happening for me, too -- goes directly to mobile site in universal search, doesn't redirect when i follow a link. (last time there was a redirect issue something had to be fixed on Wikipedia's end, if i recall correctly.)