Hi Anji,
DWP recently announced that the migration of claimants on indefinite DLA would start early, see our news item
www.benefitsandwork.co.uk/news/3121-inde...-postcodes-announced However everyone, even those on indefinite awards, has been eligible to have their DLA reassessed under the 'Right Payment program' so, if you are not in one of the postcodes mentioned, it might be that this is what is happening to you.
Whatever the reason, now that the process has started there is nothing you can do other than comply. As long as you do your part (apply for PIP and submit forms in time), your DLA award will continue in payment until 4 weeks after the PIP decision is made.
PIP help for claimants When you have other questions, please reply to this message and we will do our best to help.