I just got a new one this week, my old Dexcom was 3 or 4 years old! I'd suggest you look for a place to donate the old one. Alternatively hang on to it because you'll have a backup charger cable for work.
I'd hoped this model would have some changes, the only one was the software went from 7.0.8 to. 7.0.9. I look forward to the new Dexcom model whenever that arrives.