They come out tomorrow as far as I know.
Heres Toronto's 2012 schedule
For other teams, replace the tor with the appreviated city name IE bos for Boston, etc. ESPN's schedule page doesnt show all teams yet but playing around with this link you can get to them...
My targets right now
May 7-9 Red Sox @ KC
May 11-13 Braves @ St Louis
Next year's schedule is up! www.baseballtripplanner.com/2012
As Tim pointed out, the schedules did come out today and Baseball Trip Planner has been updated so you can start browsing through the schedule and planning your trips now. Ticket information won't be out for a few months, though.
The Missouri trip looks great - and if you want to add a couple games, you can catch the White Sox and Brewers in Chicago and Milwaukee that following weekend. Only 5 hours from Busch Stadium to US Cellular.
I really like AT&T Park in SF and wouldn't pass up on the game there. But Oakland coliseum is awful and not a very good stadium. Just my opinion as I detest multi-purpose stadiums. Then I like the 2 stadiums near LA too...
Are you going to spend time sight-seeing in either city? This would be the difference for me as I really like SF and could spend a lot of time there. Im not a big fan of LA...