If you are, the Long Count cycle actually takes just 18,980 days or ~52 solar years. Every so many Long Count cycles, the end of the Long Count comes together with the end of a Baktun, which happened on December 21st 2012. It marked the end of the 12th Baktun and the beginning of the 13th. A Baktun is 144,000 days or ~395 years. It wasn't the first time it reset. It's actually the 13th time it has reset.
Anyway, if they continue Mass Effect like they continued Halo, I'd be pretty happy. Just started watching the story of Halo 4 after having watched that of Halo 3 on Youtube, as I will never play the games (won't buy an Xbox 360 just to play them). Happily surprised by how intreging it is so far.