Hm, looking at the pts patch notes and no balance changes at all, huh? Not sure what the deal is with that. Nor any mention of fixes for some of the current bugs still in the game. Not even undoing the change to resolve to make cc less derpaderp like it was before.
Don't get me wrong, I'm actually really looking forward to the new heroic space missions, the new wz, and the "reset button" on pvp gear so even new players will be able to be competitve at the start.
There still might be even big balance changes. Because several times there were such changes between PTS and live servers but you wont see them before they'll hit live servers.
And on 30th Nov devs were talking about class balance updates in next major patch, and since it's not 1.5.3 but 1.6. i guess that should be it.