The raid legendaries will do the job for normal raid and new nightfall etc. We've got 4-5 weeks to get geared up before hard unlocks.
It's not clear if the vendor legendaries will get you to 32 though? I'm guessing that will be reserved for raid great
It will be like it is now but 31/32 instead of 29/30.
New legendaries will probably get you to level 30 (up from level 28), whilst an exotic will push you over into level 31. You will need 3/4 raid armour for level 32 or 3 raid and one exotic.
Unless they have completely changed it all mind. I can't see you getting to 31/32 with just the VG armour.