In theory, from today, SMETS1 meters can no longer be installed - all new installations should be the newer SMETS2 meters. This matters because the SMETS1 meters (the bulk of smart meters currently installed) are insecure in a number of ways, and you can't always continue using them as smart meters if you change supplier (although that's got a little better than it was).
However, the energy companies have a history of telling lies about smart meters, and I wouldn't personally trust that no more SMETS1 meters will be fitted.
Personally, I'm not interested until there's something in it for me.