This was mentioned here: Poll on Firo Block Reward Division - #122 by reuben
Additionally in the three separate topics discussing/polling the tokenomics change, there were no objections raised.
Old (5 minute blocks):
12.5 FIRO per block x 288 blocks per day = 3600 FIRO a day
New (2.5 minute blocks):
6.25 FIRO per block x 576 blocks per day = 3600 FIRO a day
The emission remains unchanged.