Currently it is 12000 r/t and 7200 ow, and on 4 May, the r/t will become 10000 points. However, I don't remember reading anything about the effect on one-way awards...
Today a one-way ticket costs 60 % of a round trip. So assuming that is not gone change, a one way ticket arn-lla will cost 6 000 points after may 4th.
So Oliver2002, wait until after may 4th to order your award ticket. At least it is not gone be more expensive to wait