As noted by iDownloadBlog,
With today’s release of iOS 7.1 beta 3, many people feared that exploits used in the evasi0n7 jailbreak would be patched. As it appears, and even though evasi0n7 cannot jailbreak iOS 7.1 beta 3 as is, Apple didn’t patch evasi0n7.
iOS 7.1 is expected to be released in March, probably at the same time with Apple’s new 5-inch phablet. Well, at least this is what anonymous sources from the supply chain claim.