"In December, Sony confirmed its intention to start a wider Android 5.0 update soon. A tweet from the official Xperia account reiterated the company’s plan to bring Android 5.0 to the Xperia Z3 and the Xperia Z2 in early 2015."
if you dont want to wait look into flashtool and xperiafirm. Then look up using fastool to flash your z2 or z3. There are many great sites that will walk you through step by step on how to do the process. I spent 1 hour today after being tired of waiting on my carrier and I did it myself. its great and was well worth the effort of reading some web pages.