What is the situation with the play off fixtures for widnes now?

Well you have to wait until after the weekend.

The best you can finish now is 3rd, worst is 5th unless Fev have a field day against Batley, (124 point victory margin).

That would mean you play either Thursday 10th or Sunday 13th. Home or Away depends on future results this week.

all depends on bonus points picked up from other teams really
if sheffield and whitehaven dont pick them up then we are 3rd

That sounds ok to me - as a Leyther!