Your home meter will read the same way it has always done.
Blood glucose meters here in the UK measure in mmol/L (Millimoles per litre). In the USA and some other countries they measure in mg/dl (milligrams per deciliter).
No home bg meters give results as a %.
The measurements that have changed are for the HbA1c, the blood tests where blood is taken from a vein by a doctor/nurse at your GP's surgery or a hospital, these used to be shown as a % or DCCT (Diabetes Control and Complications Trial) but are now shown in the new standard which is IFCC (International Federation of Clinical Chemistry) units.
Most doctors now give the HbA1c in the new IFCC measurement ie 32 as opposed to the old DCCT measurement of 5.1%. However some doctors are still offering the HbA1c results in both the old and the new to help people get used to the new system.
Personally I think it is making it harder to change as I still relate to the old system better, but I guess i'll get used to the new numbers one day.