Any implication of a Yale result to security of quantum cryptology? Quantum key distribution depends, if I don't err, on (irreversible) damages done by MITM's measurements on qbits. Now news.yale.edu/2013/01/11/new-qubit-control-bodes-well-future-quantum-computing says: 

"The Yale physicists successfully devised a new, non-destructive measurement system for observing, tracking and documenting all changes in a qubit’s state, thus preserving the qubit’s informational value."

Wouldn't the new technique, if not immediately practically, at least in long term render the security of QKD questionable?
No.  The Yale result describes a method of partial measurement that is not completely destructive to the quantum system's coherence, which is tied to its physical representation.  It is not a refutation of quantum indeterminacy, which is the basis for (provably secure) quantum key exchange.  In other words, the Yale team measured a qubit in such a way that it doesn't "fall apart" (decohere) when it's measured - in the author's words, "the measurement record faithfully reports the perturbation of the system after the fact." However, the act of measurement still affects the qubit's information content in accordance with the mathematics of quantum mechanics.