Yes, those dates for S4 are accurate. Expect it around the 2nd week in July. We'll have some S4 news coming soon!
In the meantime - here's some more information on the special feature "Inside the Writers' Room" included on Season 3 - out in a few weeks!
I really hope that the restoration work in the Season 4 trailer measures up to CBS-D standards. I've already skipped season 2, I don't want to skip anymore.
As I've said at TrekCore, it's looking good to my eyes!