Just to add more to this - I Was getting LTE while in Old Ellicott City last night. I didn't get any speed tests or anything like that, but that's 2 places I've seen it now.
I'm closer to the Giant then the Hospital - so the tower near the giant would be my guess. I haven't really been able to look at it while moving closer/farther from either site.
I have LTE at my house (Baltimore County) which seemed to turn up on Saturday or so, but have not seen it anywhere else yet. I have full bars of 4G showing on my Galaxy Nexus and speedtest shows around 8ish mbps up and down.