I noticed today on my Note II as I got to 41 in Land O'Lakes I had full signal 3G kept watching to see when it would switch to LTE on its own. It didn't switch to LTE until I had just passed the tower heading east.
BTW also did some "war-driving" (that is the old wifi search term isn't it?) yesterday in Pasco, nothing new down east lake toward McMullen. and nothing new along 19 from Tampa Road all the way up to 52.