Details are 'relatively' the same as March and April ... and I'm adding another small incentive.
On each Sunday morning at 00:01 UTC in May (starting the 8th - lol which happens to be mother's day here) the leader at exactly that time, with the lowest CDF, will get my fee from the next 2 blocks found.
Adds up to a total of 4 new prizes totalling a bit over 1BTC for the month so it's not a lot, but anyway
... and it is actually 'possible' for one miner to win all four and one of the 2 final prizes.
March rules were here:
https://bitcointalksearch.org/topic/m.14042677
Should split the Sunday bonus between the high and low CDF holders I have absolutely no bias here