Based on previous year's applicant roster post on this forum, appears last year they invited 38%/35% of applicants to interview in R1/R2 respectively, while this year, numbers are down to 28%/25% respectively. I'd say this is quite significant.
Assuming the total # invites is kept the same from last year (~1060 invites total across all rounds based on 60% pass rate after interview and 50% enrollment rate), they must be expecting slightly short of 4000 applicants total across all rounds. I believe the past year they had ~2700 applicants, so they must be seeing either a huge increase in overall app# and/OR alternatively they are expecting a higher enrollment rate this year that they are extending less invites overall (I believe enrollment rate jumped from low/mid 40% to low 50% this past year). For example, if they're now expecting 55% yield and 60% pass rate after interview, then they still would've received ~3700 apps: still a significant increase in app #. A positive indicator for the program regardless and tougher competition for all

Good luck everyone!