Hi, i think it will with the next reward :


But i don't know if that means they'all add 1 LSK to our forging rewards (thus enabling this reward to be sent earlier for little wallets) or if they'll add 1 LSK to the next payout.

In the first case, if you have 0,5 LSK and the payout threshold is, say, at 1LSK, then you'll have 1,5 LSK and the payout will occur.
In the second case,  if you have 0,5 LSK and the payout threshold is, say, at 1LSK, then you'll have to wait for your rewards to reach 1 LSK and then, you'll gain 2 LSK.