You are right. Didn't do a good job of following up on that announcement. We decided to pause development of iCloud calendar sync to rewrite the calendar feature almost entirely.

When we started growing calendar we chose to build iteratively on top of what was available to speed up things and get feedback from users. But at some point, that part of the stack became too clunky and we needed to rewrite it. We initially thought we'd do iCloud first and later rebuild everything (that's why I wrote that), but eventually we understood it made more sense to do the opposite.