Canon Professional Network Europe published a long interview with Mr. Yoshiaki Sugiyama, the engineer that worked on the design oc Canon’s SLR systems since 1978, up to the EOS-1 series (introduced in 1989).
From the interview:
CPN: What do you see as the future for EOS camera design encompassing? For example, can cameras get smaller and even easier to use? If so, how might this be achieved?
YS: “I previously said that I believe the optimum size among Canon cameras is the AL-1. I believe that the trend towards compact, lightweight equipment is a certainty among categories encompassed by advanced amateurs, and even professional equipment, [so] the entire [EOS] system will move toward a more lightweight form.
The technical challenges are: lighter, stronger materials; glass materials with a high refractive index and high permeability; improvement in low power consumption design and compact, high-capacity battery; electronic parts with a higher degree of integration.”