Morag recently posted that there will be no requirement to submit 3 cards for handicap this year.
This is technically correct, in that your handicap will not lapse if you don't have 3 cards in this year.
However, having recently read more detail on how the new system will calculate handicaps I would STRONGLY ADVISE everyone to try to submit at least 3 cards, particularly in the next few weeks while the weather is (usually!) playable - either by playing in the upcoming stableford competitions or by submitting Supplementary Score Cards.
Otherwise, there may be some anomalies thrown up by the new system and your handicap may not reflect your current playing ability - especially if you do not have many cards submitted last year either.