According to a Tweet yesterday from Blizzard's Alex Mayberry, the Diablo III patch v2.0.1, the precursor to the Reaper of Souls expansion, will go live later today in North America and tomorrow for the EU. The update will feature the reworked Paragon system, Loot 2.0 (fewer, more meaningful drops) system, clans/communities, and scaling monster levels.
There is no ETA on the patch other than sometime today after server resets.
@Beckster188 thanks for saying so! Patch 2.0.1 goes live tomorrow. RoS is will be here soon!— Alex Mayberry (@Alex_Mayberry) February 25, 2014
Let us know how the new patch treats your character after it goes live.