For the Butterfly S, LlabTooFeR says that the test phase for 4.4.2 just began, so the update might appear in March or April of this year.
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One of the best sources for Android news on Twitter, LlabTooFeR, has some news for HTC users. A tweet was sent out explaining that the HTC One, One Max and One Mini are expected to get their Android 4.4.2 KitKat updates later this month, or next month. In addition to the new OS, the update will also include the new HTC Sense 5.5 UI.