So it looks like a few folks are still confused on how this changeover is going to work. I saw rogelio posted the schedule but I think I might know why people who weren't in Beta aren't understanding. I'll do my best..
Whatever world you are in will continue as planned. You will finish your postseason and do jobs as normal. You will then do your recruiting in 2.0 style just like today.
THEN it will pause for ~48 hours. When it resumes you will be ready to do exhibitions but the it will look totally different and will be the new interface. Now you are in 3.0 HD. Refer to link to image
http://imgur.com/1qqUTpk
You will see you now have a separate scouting budget and a recruiting budget. This is based upon the number of seniors and walk ons you have at this point in time. You will now be starting your exhibitions and can now SCOUT.
http://imgur.com/CZ5b3Oc
You can also view the handy new World Schedule and will tell you when recruiting session 1 starts and ends. As well as when recruiting session 2 starts and ends.
http://imgur.com/vESpz6q
And that's it! You are now in 3.0 and you are scouting and recruiting in the new system!
TLDR:
1. Finish postseason and do jobs in current world.
2. Recruit in 2.0 style
3. Pause for 48 hours
4. Change over to 3.0
5. Do exhibitions and SCOUT in 3.0
6. Non Conf Starts
7. Conf starts and RECRUITING session 1 starts.
8. etc
Hope this helps.