It's understandable that people would look at Microsoft as an indication at what Sony might do. If I recall correctly, when the first anti-consumer rumors surfaced, a lot of people thought that either both companies would do it or neither would do it. The general sentiment was that Microsoft would not do it alone.
Also, I think I remember Sony being asked specific questions about the rumors, but they never have a straight answer. I think Yoshida confirmed that PlayStation 4 could play used games, but you could also claim the same for Xbox One.
I think it's reasonable to expect some bad news, but I personally believe Sony will do a bang-up job at E3.