I just got off the phone with PEPCO (DC/Maryland).
They told me that the two meters they are installing in my area are the Landis+Gyr Focus AXR, and the GE 1210+C.
I don't see a GE 1210+C, but I see an I-210+C (understandable mistake). The GE looks to be a single-phase meter, so I'm guessing I'll be getting the AXR.
Other than the one post here, I haven't seen any other reports of X10 problems with it, which is a good sign.
However, they don't know when we will be getting the new meter. Their goal is to have the entire region done by the end of 2012.
Well, I got the letter in the mail that PEPCO will be installing SmartMeters in my area in the immediate future.
I called and asked what type of meter they are installing, and I got through to one of the engineers that handles any problems that come up during or after the installs.
He "almost" confirmed the model numbers I was told back in November (he said, "I don't have the model numbers in front of me, but those sound right to me"), and told me that in the 8 years he has been installing these meters across the country, he hasn't heard of any reports of interference with PLC-based systems. He said he is "somewhat" familiar with X10 automation.
According to him (and PEPCO's website) the meters use wireless signals to talk back to an access point on a nearby pole, and from there use cellular or phone lines to communicate back to the utility. He told me they are NOT putting any signals on the powerline, in either direction, from the meter.
I scheduled an appointment for first thing next Monday morning, which will give me an opportunity to test my X10 system right away after the meter is installed (before the installer leaves). If something doesn't work, I'll ask the installer to put the old meter back.