I'm sure it will happen by the 30th or shortly after. I can hear all the free to play folks raging about "pay to win" when their companions are stuck at 15 and the pre-purchase folks all have leet level 30 cumpanions. It would be a just complaint.
While leveling, mostly PvE with some PvP for a change of pace or to complete daily special events for Astral Diamonds. At level cap, about an even split. When they introduce PvP foundry content, depending on how it turns out, I can see myself going 80% PvP.