That's actually my point: it's not a particularly interesting release, but it was still fun to read.
That said, let's remember here that Yammer has no real "damage" to "control" here. I'm guessing 99.9999999% of their customers could not care less whether they build things in Java or Scala or INTERCAL. The kinds of people that do care about stuff like that are disproportionally likely to sh!tc#ck about Yammer being "a dumb Twitter clone" instead of buying.
That said, let's remember here that Yammer has no real "damage" to "control" here. I'm guessing 99.9999999% of their customers could not care less whether they build things in Java or Scala or INTERCAL. The kinds of people that do care about stuff like that are disproportionally likely to sh!tc#ck about Yammer being "a dumb Twitter clone" instead of buying.