Did they have the same 'early purchase' incentives last year?
Price wise, yes. And if you pay cash/cheque you get a £10 club shop voucher.
What they hven't said is what the recommend a friend scheme is, if any. Last year you got money off your season ticket by recommending a new season ticket holder. I asked in the ticket office and they said they were hoping to announce in the next few days that this season you get club shop vouchers, I thought he said £50, but maybe I miss heard and it was £15!
As for season ticket like for like sales comparisons. Completely meaningless. Last season our last home game was not until Sun 16 May due to the playoffs. I'd imagine there is more of a surge at our last home game due to people being at the CG anyway to see the match. Makes sense rather than making a special trip.
The first meaningful season ticket indicator will be May 31st, end of early bird discount and end of current season ticket holder deadline to definitely retain their seat.