Arturo said, "Be aware that my new 90 day would commence on the day I received my annual extension, although my annual extension anniversary would remain the same as my original entry into Thailand."
Just for everyone's information and with regards to Arturo's comment above. I lodged my application to extend on 15th December, some 2 weeks before my expiry date of 30 December. I had a home visit a couple of days later - no problems - and, following a phone call to Immigration, returned to KCI on 6th January 2016. Application approved and good until 30 December 2016. The 90 date report is due again on 13th March - no way is this related to the date of the annual extension. However, it is related to the date I lodged my application to extend, 15th December 2015. This is definitely different than the info given to Arturo.