Activity is still low, but that is typical for the early stages of update testing, particularly minor ones that may not require widespread internal or external testing. As a minor update, iOS 7.1.2 is likely to focus on bug fixes and other tweaks rather than major feature additions, and it likely will not even be put through a developer testing period before release.
Visits to MacRumors.com from devices running iOS 7.1.2
Details on changes included in the update are currently unknown, but there are two issues likely to be addressed. One is a fix for an email attachment encryption issue disclosed several weeks ago. At the time the issue gained widespread publicity, Apple issued a statement indicating it was aware of the issue and that a fix would be included in a "future software update."
The second is a long-standing iMessage issue that has recently gained new attention. The issue, which results in lost messages for those switching away from the iPhone to another device and not having their phone numbers disassociated from iMessage, has been worsened recently by server problems. Just today, Apple reported those server problems have been fixed and that it will be including "an