I think that's the post I was thinking of.
The next comment Sameer gave in that same post was "This is something we can do and is on our roadmap." but he was talking about zooming in on pictures in epubs. He wasn't talking about zooming in with pinch/multi-touch...
The Touch already has zoom on images in kepubs. If you open the welcome guide, it is just a series of images. When you tap the middle to bring up the bottom menu, there is a zoom icon. It is also there for the cover page in other kepubs.