I asked Peter Turner whether Pearce had been laicized yet, and if not, whether he would be by the time he left prison. He has written the following in reply.
It is anticipated that by the time of his release from prison Fr David Pearce will be laicised.Anticipated. Not certain. Especially as it is up to Rome, not the church in the UK. I have a sneaking suspicion that he will still be a priest on the day he comes out of prison. I'll keep you posted on anything I learn on the subject.
UPDATE 10 February
I have just received an email from Peter Turner in which he says "I can now confirm that the laicisation process regarding David Pearce is now completed."