Going from past experience, they will likely not give us any kind of a time frame. Last time they did that (Season 4) they were unable to meet it, and you can imagine the reaction they got.
The only thing they have said is that it is going better than Season 6 and it might be up faster this time. Season 6 was three weeks, not counting additional time after they found a bug and had to take it offline again.
The Foundry Roundtable live Wednesdays at 7:30PM EST/4:30PM PST on twitch.tv/thefoundryroundtable "I would rather take a chance on getting a change made to the game through positive engagement than know for sure that I got a change made by complaining" -drogyn1701, May 14, 2014.