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Ok, so I checked if the drop rates were also increased for the 3rd gacha (which also changed today). Instead I found out that it only has 2 golds and 1 6*. Which makes me doubt whether or not it's a re-issued bloomability gacha, due to the amount of 5 star & 6 star knights available.
Sorry for late reply. The gacha principle should be the same as before. The thing is that they removed other 5* / 6* characters from the pool so if you roll a gold or rainbow, it'll be guaranteed banner girl (since no one else's there anymore).
% of your affection will stay the same no matter what else you'll do to your knights.
Evolution simply doubles the bonus you currently have. The affection bonus you'll get with 100% after evolution will be the same no matter if you evolved the knight and then maxed the affection or maxed affection and then evolved her.