Big jump only happen when either Nepal or Iran put into special cut off. So, I believe there is not special cut off for Asia in Apr cut off. From Feb to Mar, it only progress 625 and Mar to Apr it progress 1025 without special cut off, I think it is a good progress for Asia. What it mean is that, they start to increase the visa slot for 2nd half of the year or they start to use the unused visa slot from the past months. So, even without special cut off (which I think it will not happen) it should progress to 15k case # by Sept. When Nepal near their country limit, it will definitely push the case # beyond 15k.
DV14 for Asia is really tricky because we have 2 countries that has 6k selectees and both countries are very different in term of the outcome of the interviews. Nepal we have high visa issue rate and Iran we have high AP rate, so imagine if you want to put the special cut off for either country it will be tough because we need to find the right balance between the 2. I think special cut off will come only when Nepal are near the country limit, which is about 11-12k case # (based on 40% selectees from Nepal). So, it could be in Jun or July time frame.