The pace of S6 and S7 will be a little slower that S3-S5. CBS wanted to release 3 season in 2013, but they only need to do 2 in 2014, so they have more time. Also, S5-S7 are all being handled by CBS-D, rather than outsourcing as was done in S2 and S4.
I said something similar a while back and was quickly corrected by FrontierTrek (TrekCore), he said that their schedule is just as tight for the last two seasons, even though theoretically they'd have more time, CBS wants to stick to the same release schedule as previous years. So we'll likely see S6 in early 2014 (February-ish) and then S7 in mid 2014 (June/July-ish).
See, I could have sworn I read the opposite, either by a post FrontierTrek made or an article on TrekCore. I could very well be wrong though.
My guess would be late February or March for S6 and then July/August for S7, any hopefully DS9 S1 for Christmas 2014