1) Not qualified, but tax free up to the amount rolled over from Roth B.
2) Distributions would not be qualified until 5 years from year of rollover. Distributions would be tax free up to the amount contributed to Roth B.
3)Distributions would be qualified in 2 years, until then distributions would be tax free up to the amount rolled into the Roth A plus amount of Roth IRA basis.
4) Yes, entire balance qualified and tax free.
Note that for 1 thru 3, even though the Roth IRA is not yet qualified, under the Roth IRA ordering rules, if the Roth 401k was qualified, the entire amount rolled over is immediately tax free, and if the Roth 401k was not qualified, the amount contributed to the Roth 401k is immediately tax free.