https://youtu.be/RYwZ6GZXWhA

Season 5 End & Season 6 Start Dates:

There will be a period of time between when a Season ends and the next begins. During this time, you’ll be able to sort through your rollover rewards and review your progress on the Leaderboards. It’s a great time to reflect on the accomplishments you’ve made and enjoy the culmination of your pre and post-Season loot hunts!

Season 5 will be ending at the following dates and times for each region:

North America: Friday, April 15 @ 5:00 p.m. PDT
Europe: Friday, April 15 @ 5:00 p.m. CEST
Asia: Friday, April 15 @ 5:00 p.m. KST

Season 6 will be starting about two weeks afterwards at the following dates and times for each region:

North America: Friday, April 29 @ 5:00 p.m. PDT
Europe: Friday, April 29 @ 5:00 p.m. CEST
Asia: Friday, April 29 @ 5:00 p.m. KST

Source: http://us.battle.net/d3/en/blog/20077425/

Season 3 will be ending at the following dates and times for each region:

North America: Sunday, August 23 @ 5:00 p.m. PDT
Europe: Sunday, August 23 @ 5:00 p.m. CEST
Asia: Sunday, August 23 @ 5:00 p.m. KST

Season 4 will be starting shortly after at the following dates and times for each region:

North America: Friday, August 28 @ 5:00 p.m. PDT
Europe: Friday, August 28 @ 5:00 p.m. CEST
Asia: Friday, August 28 @ 5:00 p.m. KST

Source: http://us.battle.net/d3/en/blog/19842943

"As Season 2 comes to an end and we prepare to launch Patch 2.2.0, we’re seeing lots of anticipation among players for Season 3. In addition to the 10 new or revamped sets that will be available in the patch, Seasonal players will have all-new Season-exclusive rewards to enjoy. "

http://us.battle.net/d3/en/blog/18486733/first-look-season-3-3-31-2015

I vaguely remember backing this game in 2012 on Kickstarter. It releases today!
#1 on Steam!

https://www.youtube.com/watch?v=roK1wzOLT-k

http://store.steampowered.com/app/291650/