Since a final list has not yet been made, I would consider guessing a difficulty decline of -2.51 to -2.75%
The whole DDOS issue is likely going to cause miners to effectively go offline that based on economics should not be offline
this may turn out to be the best pick yet
real time google is -0.98%
https://docs.google.com/spreadsheets/d/1qmF2knc5rSrJLESgQJYBz8mPzpKihmSzPPQUGH7pT8g/edit#gid=204080645https://bitcoinwisdom.com/bitcoin/difficulty is +0.78% price is 276 usd
Bitcoin Difficulty: 47,427,554,951
Estimated Next Difficulty: 47,796,950,794 (+0.78%)
Adjust time: After 1109 Blocks, About 7.7 days
Hashrate(?): 326,239,702 GH/s
Block Generation Time(?):
1 block: 10.0 minutes
3 blocks: 29.9 minutes
6 blocks: 59.8 minutes