http://www.dhs.gov/xlibrary/assets/statistics/publications/FSDiversityLPR2004.pdf
Hence:
Asia "lost" Bangladesh (high-immigration country), so as a region it sends LESS "eligible" immigrants to the U.S. = more DV visas
Europe "earned" Poland (high-immigration country), so as a region it sends MORE "eligible" immigrants to the U.S. = less DV visas.
Those changes are minute (even negligible), yet even that's a tiny ray of hope...
That's not my understanding of how the region allocation works, based on the publications linked.
Asia no longer has Bangladesh as a consequence of Bangladeshi immigrants exceeding 50,000 Legal Permanent Residents in the past 5 years in the United States, and thus being classed as a High Admission state. While this means the Asia Region will not have to compete with Bangladeshi born applicants any more, it will also mean it's overall pool of Diversity Visas will be reduced proportionality, as Bangladesh will enter into the Asia High Admission Country list along the likes of India, Philippines, Pakistan, China (mainland), South Korea and Vietnam pushing up the amount of immigrants gaining residency from Asia as a region in the United States as a whole, and further reducing the need to pool from this region for the purposes of diversification proportionality. The result being fewer overall visas spread over fewer eligible countries, just like North/South America.
Asia is already classed as a High Admission Region, Bangladesh's removal from Diversity status just made it even more so. This is why Asia and North/South America always has the fewest Diversity Immigrants visas, because Asia and North/South America consistently send the most people to America, and thus are not as required for the purposes of diversification.
Poland became eligible again, which means Europeans will have to compete with Polish born applicants, but also will see a proportionate increase in their overall Diversity Pool of Visas. This is because Polish applicants are once again statistically immigrating in low enough numbers to warrant Poland becoming an additional source of potential immigrants from the European Region to pool from, for the purpose of diversifying the United States.
This is why African/Oceanic Regions has the highest overall pool in proportion to their population; they are consistently under-represented in the United States. As you will note; no Oceanic or African country is ineligible in their respective regions. Europe only has the United Kingdom (excluding N. Ireland) as an ineligible High Admission state since Poland is now eligible again.
If you look at Page 2, the Fig. 2 bar graph in the document you linked, you will see this graphically illustrated.
It remains yet to be seen, but I imagine the Asia Region will benefit from the exclusion of Bangladesh as regards to their chance of a visa; simply because Bangladesh would flood the E-DV website with applicants, even if they were capped at 7% for overall issued visas.
